SYMBOLCOMMON_NAMEaka. SYNONYMS
win.vhd_ransomware (Back to overview)

VHD Ransomware


There is no description at this point.

References
2020-07-29Kaspersky LabsGReAT
@online{great:20200729:trends:6810325, author = {GReAT}, title = {{APT trends report Q2 2020}}, date = {2020-07-29}, organization = {Kaspersky Labs}, url = {https://securelist.com/apt-trends-report-q2-2020/97937/}, language = {English}, urldate = {2020-07-30} } APT trends report Q2 2020
PhantomLance Dacls Penquin Turla elf.wellmess AppleJeus Dacls AcidBox Cobalt Strike Dacls EternalPetya Godlike12 Olympic Destroyer PlugX shadowhammer ShadowPad Sinowal VHD Ransomware Volgmer WellMess X-Agent XTunnel
2020-07-28Kaspersky LabsIvan Kwiatkowski, Pierre Delcher, Félix Aime
@online{kwiatkowski:20200728:lazarus:5b1523a, author = {Ivan Kwiatkowski and Pierre Delcher and Félix Aime}, title = {{Lazarus on the hunt for big game}}, date = {2020-07-28}, organization = {Kaspersky Labs}, url = {https://securelist.com/lazarus-on-the-hunt-for-big-game/97757/}, language = {English}, urldate = {2020-07-30} } Lazarus on the hunt for big game
Dacls Dacls Dacls VHD Ransomware
2020-03-22GrujaRS
@online{grujars:20200322:new:d94c371, author = {GrujaRS}, title = {{New #VHD (virtual hard disk)#Ransomware extension .vhd!}}, date = {2020-03-22}, url = {https://twitter.com/GrujaRS/status/1241657443282825217}, language = {English}, urldate = {2020-03-27} } New #VHD (virtual hard disk)#Ransomware extension .vhd!
VHD Ransomware
Yara Rules
[TLP:WHITE] win_vhd_ransomware_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_vhd_ransomware_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.vhd_ransomware"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 52 ffd6 8b0d???????? 6a00 8d858cb4ffff 50 }
            // n = 6, score = 100
            //   52                   | push                edx
            //   ffd6                 | call                esi
            //   8b0d????????         |                     
            //   6a00                 | push                0
            //   8d858cb4ffff         | lea                 eax, [ebp - 0x4b74]
            //   50                   | push                eax

        $sequence_1 = { 8bc3 85c0 7e0f 8bc8 }
            // n = 4, score = 100
            //   8bc3                 | mov                 eax, ebx
            //   85c0                 | test                eax, eax
            //   7e0f                 | jle                 0x11
            //   8bc8                 | mov                 ecx, eax

        $sequence_2 = { 7d17 b904000000 2bce 51 8d4435d8 6a00 50 }
            // n = 7, score = 100
            //   7d17                 | jge                 0x19
            //   b904000000           | mov                 ecx, 4
            //   2bce                 | sub                 ecx, esi
            //   51                   | push                ecx
            //   8d4435d8             | lea                 eax, [ebp + esi - 0x28]
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_3 = { 39b50cfdffff 720f 8b85f8fcffff 50 e8???????? 83c404 53 }
            // n = 7, score = 100
            //   39b50cfdffff         | cmp                 dword ptr [ebp - 0x2f4], esi
            //   720f                 | jb                  0x11
            //   8b85f8fcffff         | mov                 eax, dword ptr [ebp - 0x308]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   53                   | push                ebx

        $sequence_4 = { 8d7a04 b9c8000000 f3ab 8b8574f6ffff 33c9 8902 }
            // n = 6, score = 100
            //   8d7a04               | lea                 edi, [edx + 4]
            //   b9c8000000           | mov                 ecx, 0xc8
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8b8574f6ffff         | mov                 eax, dword ptr [ebp - 0x98c]
            //   33c9                 | xor                 ecx, ecx
            //   8902                 | mov                 dword ptr [edx], eax

        $sequence_5 = { 33c0 8d4b04 8d9b00000000 8b11 f7d2 899485d4fcffff }
            // n = 6, score = 100
            //   33c0                 | xor                 eax, eax
            //   8d4b04               | lea                 ecx, [ebx + 4]
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   f7d2                 | not                 edx
            //   899485d4fcffff       | mov                 dword ptr [ebp + eax*4 - 0x32c], edx

        $sequence_6 = { c1e706 8b0485c0d44100 8d44380c 50 ff15???????? 8b45e4 }
            // n = 6, score = 100
            //   c1e706               | shl                 edi, 6
            //   8b0485c0d44100       | mov                 eax, dword ptr [eax*4 + 0x41d4c0]
            //   8d44380c             | lea                 eax, [eax + edi + 0xc]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]

        $sequence_7 = { 47 83ff04 7ce2 8b4dec 8ac1 02c0 8ad5 }
            // n = 7, score = 100
            //   47                   | inc                 edi
            //   83ff04               | cmp                 edi, 4
            //   7ce2                 | jl                  0xffffffe4
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   8ac1                 | mov                 al, cl
            //   02c0                 | add                 al, al
            //   8ad5                 | mov                 dl, ch

        $sequence_8 = { 8b13 57 33c0 8d7e04 b9c8000000 f3ab }
            // n = 6, score = 100
            //   8b13                 | mov                 edx, dword ptr [ebx]
            //   57                   | push                edi
            //   33c0                 | xor                 eax, eax
            //   8d7e04               | lea                 edi, [esi + 4]
            //   b9c8000000           | mov                 ecx, 0xc8
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_9 = { ff15???????? 32c0 e9???????? 6a00 8d8588b4ffff 50 6800200000 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   32c0                 | xor                 al, al
            //   e9????????           |                     
            //   6a00                 | push                0
            //   8d8588b4ffff         | lea                 eax, [ebp - 0x4b78]
            //   50                   | push                eax
            //   6800200000           | push                0x2000

    condition:
        7 of them and filesize < 275456
}
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