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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_vhd_ransomware_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.vhd_ransomware"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 8d8da8f9ffff 51 e8???????? 8b9da0f9ffff 33c0 b9c8000000 }
            // n = 6, score = 100
            //   8d8da8f9ffff         | lea                 ecx, [ebp - 0x658]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b9da0f9ffff         | mov                 ebx, dword ptr [ebp - 0x660]
            //   33c0                 | xor                 eax, eax
            //   b9c8000000           | mov                 ecx, 0xc8

        $sequence_1 = { 33cd e8???????? 8be5 5d c24c06 80bd53f3ffff00 742c }
            // n = 7, score = 100
            //   33cd                 | xor                 ecx, ebp
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c24c06               | ret                 0x64c
            //   80bd53f3ffff00       | cmp                 byte ptr [ebp - 0xcad], 0
            //   742c                 | je                  0x2e

        $sequence_2 = { f3a5 8db530030000 8d7d0c e8???????? b9c8000000 84c0 7445 }
            // n = 7, score = 100
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8db530030000         | lea                 esi, [ebp + 0x330]
            //   8d7d0c               | lea                 edi, [ebp + 0xc]
            //   e8????????           |                     
            //   b9c8000000           | mov                 ecx, 0xc8
            //   84c0                 | test                al, al
            //   7445                 | je                  0x47

        $sequence_3 = { 83c404 53 89b544fdffff c78540fdffff00000000 c68530fdffff00 }
            // n = 5, score = 100
            //   83c404               | add                 esp, 4
            //   53                   | push                ebx
            //   89b544fdffff         | mov                 dword ptr [ebp - 0x2bc], esi
            //   c78540fdffff00000000     | mov    dword ptr [ebp - 0x2c0], 0
            //   c68530fdffff00       | mov                 byte ptr [ebp - 0x2d0], 0

        $sequence_4 = { 83c404 33c0 898d9cf9ffff 85f6 740f 8d541f04 8a1402 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   33c0                 | xor                 eax, eax
            //   898d9cf9ffff         | mov                 dword ptr [ebp - 0x664], ecx
            //   85f6                 | test                esi, esi
            //   740f                 | je                  0x11
            //   8d541f04             | lea                 edx, [edi + ebx + 4]
            //   8a1402               | mov                 dl, byte ptr [edx + eax]

        $sequence_5 = { 66895c2460 897c241c c7442420c05d4000 897c2424 897c2428 }
            // n = 5, score = 100
            //   66895c2460           | mov                 word ptr [esp + 0x60], bx
            //   897c241c             | mov                 dword ptr [esp + 0x1c], edi
            //   c7442420c05d4000     | mov                 dword ptr [esp + 0x20], 0x405dc0
            //   897c2424             | mov                 dword ptr [esp + 0x24], edi
            //   897c2428             | mov                 dword ptr [esp + 0x28], edi

        $sequence_6 = { 8b8588b4ffff 85c0 0f846a010000 6a01 f7d8 99 6a00 }
            // n = 7, score = 100
            //   8b8588b4ffff         | mov                 eax, dword ptr [ebp - 0x4b78]
            //   85c0                 | test                eax, eax
            //   0f846a010000         | je                  0x170
            //   6a01                 | push                1
            //   f7d8                 | neg                 eax
            //   99                   | cdq                 
            //   6a00                 | push                0

        $sequence_7 = { 8d85f0fdffff 83c410 8d5002 668b08 83c002 663bce 75f5 }
            // n = 7, score = 100
            //   8d85f0fdffff         | lea                 eax, [ebp - 0x210]
            //   83c410               | add                 esp, 0x10
            //   8d5002               | lea                 edx, [eax + 2]
            //   668b08               | mov                 cx, word ptr [eax]
            //   83c002               | add                 eax, 2
            //   663bce               | cmp                 cx, si
            //   75f5                 | jne                 0xfffffff7

        $sequence_8 = { 398530030000 7e1b 8d4a04 8da42400000000 8bb48534030000 8931 40 }
            // n = 7, score = 100
            //   398530030000         | cmp                 dword ptr [ebp + 0x330], eax
            //   7e1b                 | jle                 0x1d
            //   8d4a04               | lea                 ecx, [edx + 4]
            //   8da42400000000       | lea                 esp, [esp]
            //   8bb48534030000       | mov                 esi, dword ptr [ebp + eax*4 + 0x334]
            //   8931                 | mov                 dword ptr [ecx], esi
            //   40                   | inc                 eax

        $sequence_9 = { 898d24f0ffff 33c9 394d08 7e18 8d550c 8bc3 }
            // n = 6, score = 100
            //   898d24f0ffff         | mov                 dword ptr [ebp - 0xfdc], ecx
            //   33c9                 | xor                 ecx, ecx
            //   394d08               | cmp                 dword ptr [ebp + 8], ecx
            //   7e18                 | jle                 0x1a
            //   8d550c               | lea                 edx, [ebp + 0xc]
            //   8bc3                 | mov                 eax, ebx

    condition:
        7 of them and filesize < 275456
}
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