SYMBOLCOMMON_NAMEaka. SYNONYMS
win.cobint (Back to overview)

CobInt

aka: COOLPANTS

Actor(s): Cobalt


CobInt, is a self-developed backdoor of the Cobalt group. The modular tool has capabilities to collect initial intelligence information about the compromised machine and stream video from its desktop. If the operator decides that the system is of interest, the backdoor will download and launch CobaltStrike framework stager. It's CRM mailslot module was also observed being downloaded by ISFB.

References
2020-06-16PTSecurityPT ESC Threat Intelligence
@online{intelligence:20200616:cobalt:2071fd2, author = {PT ESC Threat Intelligence}, title = {{Cobalt: tactics and tools update}}, date = {2020-06-16}, organization = {PTSecurity}, url = {https://www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/cobalt_upd_ttps/}, language = {English}, urldate = {2020-06-16} } Cobalt: tactics and tools update
CobInt
2020-03-04CrowdStrikeCrowdStrike
@techreport{crowdstrike:20200304:2020:818c85f, author = {CrowdStrike}, title = {{2020 CrowdStrike Global Threat Report}}, date = {2020-03-04}, institution = {CrowdStrike}, url = {https://go.crowdstrike.com/rs/281-OBQ-266/images/Report2020CrowdStrikeGlobalThreatReport.pdf}, language = {English}, urldate = {2020-07-24} } 2020 CrowdStrike Global Threat Report
MESSAGETAP More_eggs 8.t Dropper Anchor BabyShark BadNews Clop Cobalt Strike CobInt Cobra Carbon System Cutwail DanaBot Dharma DoppelDridex DoppelPaymer Dridex Emotet FlawedAmmyy FriedEx Gandcrab Get2 IcedID ISFB KerrDown LightNeuron LockerGoga Maze MECHANICAL Necurs Nokki Outlook Backdoor Phobos Predator The Thief QakBot REvil RobinHood Ryuk SDBbot Skipper SmokeLoader TerraRecon TerraStealer TerraTV TinyLoader TrickBot Vidar Winnti ANTHROPOID SPIDER APT23 APT31 APT39 APT40 BlackTech BuhTrap Charming Kitten CLOCKWORK SPIDER DOPPEL SPIDER FIN7 Gamaredon Group GOBLIN PANDA MONTY SPIDER MUSTANG PANDA NARWHAL SPIDER NOCTURNAL SPIDER PINCHY SPIDER SALTY SPIDER SCULLY SPIDER SMOKY SPIDER Thrip VENOM SPIDER VICEROY TIGER
2020-03-03PWC UKPWC UK
@techreport{uk:20200303:cyber:1f1eef0, author = {PWC UK}, title = {{Cyber Threats 2019:A Year in Retrospect}}, date = {2020-03-03}, institution = {PWC UK}, url = {https://www.pwc.co.uk/cyber-security/assets/cyber-threats-2019-retrospect.pdf}, language = {English}, urldate = {2020-03-03} } Cyber Threats 2019:A Year in Retrospect
KevDroid MESSAGETAP magecart AndroMut Cobalt Strike CobInt Crimson RAT DNSpionage Dridex Dtrack Emotet FlawedAmmyy FlawedGrace FriedEx Gandcrab Get2 GlobeImposter Grateful POS ISFB Kazuar LockerGoga Nokki QakBot Ramnit REvil Rifdoor RokRAT Ryuk shadowhammer ShadowPad Shifu Skipper StoneDrill Stuxnet TrickBot Winnti ZeroCleare APT41 MUSTANG PANDA
2020SecureworksSecureWorks
@online{secureworks:2020:gold:1892bc8, author = {SecureWorks}, title = {{GOLD KINGSWOOD}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/gold-kingswood}, language = {English}, urldate = {2020-05-23} } GOLD KINGSWOOD
More_eggs ATMSpitter Cobalt Strike CobInt MimiKatz
2020SecureworksSecureWorks
@online{secureworks:2020:gold:983570b, author = {SecureWorks}, title = {{GOLD KINGSWOOD}}, date = {2020}, organization = {Secureworks}, url = {http://www.secureworks.com/research/threat-profiles/gold-kingswood}, language = {English}, urldate = {2020-05-23} } GOLD KINGSWOOD
More_eggs ATMSpitter Cobalt Strike CobInt MimiKatz Cobalt
2018-09-11ProofpointProofpoint Staff
@online{staff:20180911:new:14fda4a, author = {Proofpoint Staff}, title = {{New modular downloaders fingerprint systems - Part 3: CobInt}}, date = {2018-09-11}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/new-modular-downloaders-fingerprint-systems-part-3-cobint}, language = {English}, urldate = {2019-12-20} } New modular downloaders fingerprint systems - Part 3: CobInt
CobInt
2018-08-30NetScoutASERT Team
@online{team:20180830:double:e5d9e22, author = {ASERT Team}, title = {{Double the Infection, Double the Fun}}, date = {2018-08-30}, organization = {NetScout}, url = {https://asert.arbornetworks.com/double-the-infection-double-the-fun/}, language = {English}, urldate = {2020-01-08} } Double the Infection, Double the Fun
More_eggs CobInt
2018-08-30NetScoutASERT Team
@online{team:20180830:double:8129db5, author = {ASERT Team}, title = {{Double the Infection, Double the Fun}}, date = {2018-08-30}, organization = {NetScout}, url = {https://www.netscout.com/blog/asert/double-infection-double-fun}, language = {English}, urldate = {2020-01-05} } Double the Infection, Double the Fun
CobInt
2018-05-29Group-IBRustam Mirkasymov
@online{mirkasymov:20180529:cobalt:b344169, author = {Rustam Mirkasymov}, title = {{Cobalt Renaissance: new attacks and joint operations}}, date = {2018-05-29}, organization = {Group-IB}, url = {https://www.group-ib.com/blog/renaissance}, language = {English}, urldate = {2019-10-22} } Cobalt Renaissance: new attacks and joint operations
CobInt
Yara Rules
[TLP:WHITE] win_cobint_auto (20220808 | Detects win.cobint.)
rule win_cobint_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.cobint."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cobint"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { a1???????? 03c9 897cc808 8b15???????? a1???????? }
            // n = 5, score = 400
            //   a1????????           |                     
            //   03c9                 | add                 ecx, ecx
            //   897cc808             | mov                 dword ptr [eax + ecx*8 + 8], edi
            //   8b15????????         |                     
            //   a1????????           |                     

        $sequence_1 = { e8???????? 83c40c 0fb6c0 5d c3 ff751c }
            // n = 6, score = 400
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   0fb6c0               | movzx               eax, al
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   ff751c               | push                dword ptr [ebp + 0x1c]

        $sequence_2 = { 8b5d08 8bc1 3918 0f84a0000000 42 }
            // n = 5, score = 400
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   8bc1                 | mov                 eax, ecx
            //   3918                 | cmp                 dword ptr [eax], ebx
            //   0f84a0000000         | je                  0xa6
            //   42                   | inc                 edx

        $sequence_3 = { 56 51 50 e8???????? 83c40c eb23 }
            // n = 6, score = 400
            //   56                   | push                esi
            //   51                   | push                ecx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   eb23                 | jmp                 0x25

        $sequence_4 = { 7c1f 8b4508 8b08 8b4004 3bc8 }
            // n = 5, score = 400
            //   7c1f                 | jl                  0x21
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   3bc8                 | cmp                 ecx, eax

        $sequence_5 = { 57 56 8b35???????? ffd6 53 }
            // n = 5, score = 400
            //   57                   | push                edi
            //   56                   | push                esi
            //   8b35????????         |                     
            //   ffd6                 | call                esi
            //   53                   | push                ebx

        $sequence_6 = { 3bc8 7f13 85c9 780f 85c0 780b }
            // n = 6, score = 400
            //   3bc8                 | cmp                 ecx, eax
            //   7f13                 | jg                  0x15
            //   85c9                 | test                ecx, ecx
            //   780f                 | js                  0x11
            //   85c0                 | test                eax, eax
            //   780b                 | js                  0xd

        $sequence_7 = { 7437 8b4de8 8d1430 3bd1 7618 }
            // n = 5, score = 400
            //   7437                 | je                  0x39
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   8d1430               | lea                 edx, [eax + esi]
            //   3bd1                 | cmp                 edx, ecx
            //   7618                 | jbe                 0x1a

        $sequence_8 = { e8???????? 8945f8 8d45c4 50 8d45f0 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   50                   | push                eax
            //   8d45f0               | lea                 eax, [ebp - 0x10]

        $sequence_9 = { 85c0 75e2 33c9 8bdf 85ff 7e1e }
            // n = 6, score = 200
            //   85c0                 | test                eax, eax
            //   75e2                 | jne                 0xffffffe4
            //   33c9                 | xor                 ecx, ecx
            //   8bdf                 | mov                 ebx, edi
            //   85ff                 | test                edi, edi
            //   7e1e                 | jle                 0x20

        $sequence_10 = { 1a807c170e81 7cd7 9b 807c909090 }
            // n = 4, score = 200
            //   1a807c170e81         | sbb                 al, byte ptr [eax - 0x7ef1e884]
            //   7cd7                 | jl                  0xffffffd9
            //   9b                   | wait                
            //   807c909090           | cmp                 byte ptr [eax + edx*4 - 0x70], 0x90

        $sequence_11 = { 740d 8b5508 0355f0 8a45ec 8802 eb0b }
            // n = 6, score = 200
            //   740d                 | je                  0xf
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0355f0               | add                 edx, dword ptr [ebp - 0x10]
            //   8a45ec               | mov                 al, byte ptr [ebp - 0x14]
            //   8802                 | mov                 byte ptr [edx], al
            //   eb0b                 | jmp                 0xd

        $sequence_12 = { 83c005 c3 31b7807c30ae 807c909090 90 }
            // n = 5, score = 200
            //   83c005               | add                 eax, 5
            //   c3                   | ret                 
            //   31b7807c30ae         | xor                 dword ptr [edi - 0x51cf8380], esi
            //   807c909090           | cmp                 byte ptr [eax + edx*4 - 0x70], 0x90
            //   90                   | nop                 

        $sequence_13 = { 90 90 90 bffc807c28 1a807c170e81 7cd7 }
            // n = 6, score = 200
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 
            //   bffc807c28           | mov                 edi, 0x287c80fc
            //   1a807c170e81         | sbb                 al, byte ptr [eax - 0x7ef1e884]
            //   7cd7                 | jl                  0xffffffd9

        $sequence_14 = { ba6a62f095 e8???????? 6a40 6800300000 6800a80000 6a00 ffd0 }
            // n = 7, score = 200
            //   ba6a62f095           | mov                 edx, 0x95f0626a
            //   e8????????           |                     
            //   6a40                 | push                0x40
            //   6800300000           | push                0x3000
            //   6800a80000           | push                0xa800
            //   6a00                 | push                0
            //   ffd0                 | call                eax

        $sequence_15 = { ffd0 eb1a 837dec00 7418 037dec }
            // n = 5, score = 200
            //   ffd0                 | call                eax
            //   eb1a                 | jmp                 0x1c
            //   837dec00             | cmp                 dword ptr [ebp - 0x14], 0
            //   7418                 | je                  0x1a
            //   037dec               | add                 edi, dword ptr [ebp - 0x14]

        $sequence_16 = { 8b45f8 3945f0 7412 8b45ec 42 3b5318 72c4 }
            // n = 7, score = 200
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   3945f0               | cmp                 dword ptr [ebp - 0x10], eax
            //   7412                 | je                  0x14
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   42                   | inc                 edx
            //   3b5318               | cmp                 edx, dword ptr [ebx + 0x18]
            //   72c4                 | jb                  0xffffffc6

        $sequence_17 = { 8b4d08 034df0 8a55ed 8811 }
            // n = 4, score = 200
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   034df0               | add                 ecx, dword ptr [ebp - 0x10]
            //   8a55ed               | mov                 dl, byte ptr [ebp - 0x13]
            //   8811                 | mov                 byte ptr [ecx], dl

        $sequence_18 = { e10b 96 7c90 90 }
            // n = 4, score = 200
            //   e10b                 | loope               0xd
            //   96                   | xchg                eax, esi
            //   7c90                 | jl                  0xffffff92
            //   90                   | nop                 

        $sequence_19 = { 6a41 53 ffd6 baf608f7a4 8bcf }
            // n = 5, score = 200
            //   6a41                 | push                0x41
            //   53                   | push                ebx
            //   ffd6                 | call                esi
            //   baf608f7a4           | mov                 edx, 0xa4f708f6
            //   8bcf                 | mov                 ecx, edi

        $sequence_20 = { 90 90 90 90 90 749b }
            // n = 6, score = 200
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 
            //   749b                 | je                  0xffffff9d

        $sequence_21 = { 749b 807ce19a80 7c90 90 90 90 }
            // n = 6, score = 200
            //   749b                 | je                  0xffffff9d
            //   807ce19a80           | cmp                 byte ptr [ecx - 0x66], 0x80
            //   7c90                 | jl                  0xffffff92
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 

        $sequence_22 = { 43 3bcf 7ce2 8b4dbc }
            // n = 4, score = 200
            //   43                   | inc                 ebx
            //   3bcf                 | cmp                 ecx, edi
            //   7ce2                 | jl                  0xffffffe4
            //   8b4dbc               | mov                 ecx, dword ptr [ebp - 0x44]

        $sequence_23 = { 8b7228 8bf8 663906 742c 33db }
            // n = 5, score = 200
            //   8b7228               | mov                 esi, dword ptr [edx + 0x28]
            //   8bf8                 | mov                 edi, eax
            //   663906               | cmp                 word ptr [esi], ax
            //   742c                 | je                  0x2e
            //   33db                 | xor                 ebx, ebx

    condition:
        7 of them and filesize < 65536
}
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