SYMBOLCOMMON_NAMEaka. SYNONYMS
win.pseudo_manuscrypt (Back to overview)

PseudoManuscrypt


There is no description at this point.

References
2022-10-05BitSightStanislas Arnoud, João Godinho
@online{arnoud:20221005:sinkholing:8a928c6, author = {Stanislas Arnoud and João Godinho}, title = {{Sinkholing PseudoManuscrypt: From Zero To 50k Infections - Part 1}}, date = {2022-10-05}, organization = {BitSight}, url = {https://www.bitsight.com/blog/zero-50k-infections-pseudomanuscrypt-sinkholing-part-1}, language = {English}, urldate = {2022-10-07} } Sinkholing PseudoManuscrypt: From Zero To 50k Infections - Part 1
PrivateLoader PseudoManuscrypt
2022-09-26KasperskyHaim Zigel, Oleg Kupreev, Artem Ushkov
@online{zigel:20220926:nullmixer:c623b01, author = {Haim Zigel and Oleg Kupreev and Artem Ushkov}, title = {{NullMixer: oodles of Trojans in a single dropper}}, date = {2022-09-26}, organization = {Kaspersky}, url = {https://securelist.com/nullmixer-oodles-of-trojans-in-a-single-dropper/107498/}, language = {English}, urldate = {2023-02-06} } NullMixer: oodles of Trojans in a single dropper
ColdStealer DanaBot GCleaner Nullmixer PrivateLoader PseudoManuscrypt RedLine Stealer SmokeLoader Vidar
2022-02-18AhnLabASEC Analysis Team
@online{team:20220218:pseudomanuscrypt:4aa75d9, author = {ASEC Analysis Team}, title = {{PseudoManuscrypt Being Distributed in the Same Method as Cryptbot}}, date = {2022-02-18}, organization = {AhnLab}, url = {https://asec.ahnlab.com/en/31683/}, language = {English}, urldate = {2022-02-19} } PseudoManuscrypt Being Distributed in the Same Method as Cryptbot
CryptBot PseudoManuscrypt
2021-12-16Kaspersky Lab ICS CERT
@online{cert:20211216:pseudomanuscrypt:808ef18, author = {Kaspersky Lab ICS CERT}, title = {{PseudoManuscrypt: a mass-scale spyware attack campaign}}, date = {2021-12-16}, url = {https://ics-cert.kaspersky.com/reports/2021/12/16/pseudomanuscrypt-a-mass-scale-spyware-attack-campaign/}, language = {English}, urldate = {2021-12-23} } PseudoManuscrypt: a mass-scale spyware attack campaign
PseudoManuscrypt
Yara Rules
[TLP:WHITE] win_pseudo_manuscrypt_auto (20230125 | Detects win.pseudo_manuscrypt.)
rule win_pseudo_manuscrypt_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.pseudo_manuscrypt."
        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.pseudo_manuscrypt"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8b45f8 894dfc 3bc8 7f31 8b4710 03470c 2b4718 }
            // n = 7, score = 100
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   3bc8                 | cmp                 ecx, eax
            //   7f31                 | jg                  0x33
            //   8b4710               | mov                 eax, dword ptr [edi + 0x10]
            //   03470c               | add                 eax, dword ptr [edi + 0xc]
            //   2b4718               | sub                 eax, dword ptr [edi + 0x18]

        $sequence_1 = { b801000000 5b 8be5 5d c3 ff36 6a00 }
            // n = 7, score = 100
            //   b801000000           | mov                 eax, 1
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   ff36                 | push                dword ptr [esi]
            //   6a00                 | push                0

        $sequence_2 = { 8d4805 03ce 51 53 ff15???????? 8bd8 03f3 }
            // n = 7, score = 100
            //   8d4805               | lea                 ecx, [eax + 5]
            //   03ce                 | add                 ecx, esi
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   03f3                 | add                 esi, ebx

        $sequence_3 = { 8d85f0fdffff 50 ff15???????? 8b95e4fdffff 8b8de8fdffff 42 83c118 }
            // n = 7, score = 100
            //   8d85f0fdffff         | lea                 eax, [ebp - 0x210]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b95e4fdffff         | mov                 edx, dword ptr [ebp - 0x21c]
            //   8b8de8fdffff         | mov                 ecx, dword ptr [ebp - 0x218]
            //   42                   | inc                 edx
            //   83c118               | add                 ecx, 0x18

        $sequence_4 = { ff7024 83c038 50 8d4138 50 e8???????? 83c40c }
            // n = 7, score = 100
            //   ff7024               | push                dword ptr [eax + 0x24]
            //   83c038               | add                 eax, 0x38
            //   50                   | push                eax
            //   8d4138               | lea                 eax, [ecx + 0x38]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_5 = { e8???????? 83c404 85c0 743e 85db 744f 66833b00 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   743e                 | je                  0x40
            //   85db                 | test                ebx, ebx
            //   744f                 | je                  0x51
            //   66833b00             | cmp                 word ptr [ebx], 0

        $sequence_6 = { 33c0 5f 8be5 5d c3 6a00 8d4df8 }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   6a00                 | push                0
            //   8d4df8               | lea                 ecx, [ebp - 8]

        $sequence_7 = { 8b45d4 ebc1 8b4d14 8b45c8 03c3 2901 8d45ff }
            // n = 7, score = 100
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]
            //   ebc1                 | jmp                 0xffffffc3
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]
            //   8b45c8               | mov                 eax, dword ptr [ebp - 0x38]
            //   03c3                 | add                 eax, ebx
            //   2901                 | sub                 dword ptr [ecx], eax
            //   8d45ff               | lea                 eax, [ebp - 1]

        $sequence_8 = { 2bc1 c1f802 03f8 85c9 740f 8b4308 2bc1 }
            // n = 7, score = 100
            //   2bc1                 | sub                 eax, ecx
            //   c1f802               | sar                 eax, 2
            //   03f8                 | add                 edi, eax
            //   85c9                 | test                ecx, ecx
            //   740f                 | je                  0x11
            //   8b4308               | mov                 eax, dword ptr [ebx + 8]
            //   2bc1                 | sub                 eax, ecx

        $sequence_9 = { 8d040e 50 e8???????? 83c410 c745fc02000000 8b4b04 8bc1 }
            // n = 7, score = 100
            //   8d040e               | lea                 eax, [esi + ecx]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   c745fc02000000       | mov                 dword ptr [ebp - 4], 2
            //   8b4b04               | mov                 ecx, dword ptr [ebx + 4]
            //   8bc1                 | mov                 eax, ecx

    condition:
        7 of them and filesize < 748544
}
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