SYMBOLCOMMON_NAMEaka. SYNONYMS
win.unidentified_112 (Back to overview)

Unidentified 112 (Rust-based Stealer)

VTCollection    

A Rust-based stealer, observed by Seqrite, along TTPs overlapping with Pakistan-linked APT groups.

References
2023-12-21 ⋅ Seqrite ⋅ Sathwik Ram Prakki
Operation RusticWeb targets Indian Govt: From Rust-based malware to Web-service exfiltration
Ares Unidentified 112 (Rust-based Stealer)
Yara Rules
[TLP:WHITE] win_unidentified_112_auto (20260917 | Detects win.unidentified_112.)
rule win_unidentified_112_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.unidentified_112."
        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.unidentified_112"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { e9???????? 4c8d053e850e00 31c9 31d2 ff15???????? 4885c0 0f84e2000000 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   4c8d053e850e00       | lea                 ecx, [0xd9084]
            //   31c9                 | mov                 edx, 1
            //   31d2                 | dec                 eax
            //   ff15????????         |                     
            //   4885c0               | add                 esp, 0x48
            //   0f84e2000000         | dec                 esp

        $sequence_1 = { e8???????? 4889c3 4889c1 e8???????? 84c0 0f8485000000 48833f00 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   4889c3               | add                 esp, 0x28
            //   4889c1               | pop                 ebx
            //   e8????????           |                     
            //   84c0                 | pop                 edi
            //   0f8485000000         | pop                 esi
            //   48833f00             | dec                 eax

        $sequence_2 = { e8???????? 3401 0fb64e18 84c9 7413 e9???????? 31c0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   3401                 | lea                 ecx, [ebp + 0x300]
            //   0fb64e18             | mov                 byte ptr [ebp + 0x4ac], 0
            //   84c9                 | movups              xmm0, xmmword ptr [ebp + 0x7d0]
            //   7413                 | movups              xmm1, xmmword ptr [ebp + 0x7e0]
            //   e9????????           |                     
            //   31c0                 | movaps              xmmword ptr [ebp + 0x430], xmm0

        $sequence_3 = { ff5370 f048ff07 7e31 b901000000 eb10 488b7808 488b5810 }
            // n = 7, score = 100
            //   ff5370               | je                  0x5f
            //   f048ff07             | dec                 eax
            //   7e31                 | mov                 eax, dword ptr [ebx + 0x58]
            //   b901000000           | dec                 eax
            //   eb10                 | mov                 ecx, edi
            //   488b7808             | dec                 eax
            //   488b5810             | mov                 edx, esi

        $sequence_4 = { f048ff08 7510 488b45f8 488d8858010000 e8???????? 488b45f8 488d88c0010000 }
            // n = 7, score = 100
            //   f048ff08             | lea                 ecx, [eax + 0x150]
            //   7510                 | dec                 eax
            //   488b45f8             | mov                 eax, dword ptr [ebp - 8]
            //   488d8858010000       | mov                 byte ptr [eax + 0x290], 0
            //   e8????????           |                     
            //   488b45f8             | dec                 eax
            //   488d88c0010000       | lea                 ecx, [eax + 0x158]

        $sequence_5 = { e8???????? 83bc248800000006 742f 488d9c2488000000 0f1f8000000000 4889d9 e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83bc248800000006     | dec                 eax
            //   742f                 | cmp                 dword ptr [ebp + 0x10], 2
            //   488d9c2488000000     | cmp                 dword ptr [ebp + 0x20], 2
            //   0f1f8000000000       | je                  0xffffffba
            //   4889d9               | dec                 eax
            //   e8????????           |                     

        $sequence_6 = { c6853504000001 c6853404000000 c6853304000001 e8???????? 84c0 0f84f8000000 488b0d???????? }
            // n = 7, score = 100
            //   c6853504000001       | mov                 eax, dword ptr [ebp + 0x358]
            //   c6853404000000       | movaps              xmm0, xmmword ptr [ebp + 0x4b0]
            //   c6853304000001       | movaps              xmm1, xmmword ptr [ebp + 0x4c0]
            //   e8????????           |                     
            //   84c0                 | movaps              xmmword ptr [ebp + 0x2e0], xmm1
            //   0f84f8000000         | mov                 byte ptr [ebp + 0x51e], 1
            //   488b0d????????       |                     

        $sequence_7 = { 89c3 807d4800 4c8b7d38 0f84d8000000 c6454f00 4c89f9 ff15???????? }
            // n = 7, score = 100
            //   89c3                 | mov                 eax, dword ptr [ebp]
            //   807d4800             | dec                 eax
            //   4c8b7d38             | test                eax, eax
            //   0f84d8000000         | jne                 0x74f
            //   c6454f00             | movzx               edx, byte ptr [eax + 0x10]
            //   4c89f9               | test                dl, dl
            //   ff15????????         |                     

        $sequence_8 = { e8???????? 4801c3 48895d68 4983ff02 0f86ae010000 4983c630 48897d10 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   4801c3               | dec                 eax
            //   48895d68             | mov                 eax, dword ptr [ebp + 0x1e0]
            //   4983ff02             | cmp                 eax, 1
            //   0f86ae010000         | jne                 0xfffffe8a
            //   4983c630             | dec                 eax
            //   48897d10             | mov                 edx, dword ptr [ebp + 0x1f0]

        $sequence_9 = { e8???????? e9???????? 488b55e0 4885d2 741d 41b801000000 488b4de8 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   e9????????           |                     
            //   488b55e0             | dec                 esp
            //   4885d2               | mov                 edx, edi
            //   741d                 | mov                 byte ptr [ebp + 0x600], 1
            //   41b801000000         | dec                 eax
            //   488b4de8             | mov                 ecx, esi

    condition:
        7 of them and filesize < 7317504
}
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