SYMBOLCOMMON_NAMEaka. SYNONYMS
win.andromut (Back to overview)

AndroMut

aka: Gelup

Actor(s): TA505

VTCollection    

According to Proofpoint, AndroMut is a new downloader malware written in C++ that Proofpoint researchers began observing in the wild in June 2019. The “Andro” part of the name comes from some of the pieces which bear resemblance to another downloader malware known as Andromeda [1] and “Mut” is based off a mutex that the analyzed sample creates: “mutshellmy777”.

References
2020-12-14 ⋅ Blueliv ⋅ Alberto Marín, Blueliv Labs Team, Carlos Rubio
Using Qiling Framework to Unpack TA505 packed samples
AndroMut Azorult Silence TinyMet
2020-08-20 ⋅ CERT-FR ⋅ CERT-FR
Development of the Activity of the TA505 Cybercriminal Group
AndroMut Bart Clop Dridex FlawedAmmyy FlawedGrace Get2 Locky Marap QuantLoader SDBbot ServHelper tRat TrickBot
2020-06-22 ⋅ ⋅ CERT-FR ⋅ CERT-FR
Évolution De Lactivité du Groupe Cybercriminel TA505
Amadey AndroMut Bart Clop Dridex FlawedGrace Gandcrab Get2 GlobeImposter Jaff Locky Marap Philadephia Ransom QuantLoader Scarab Ransomware SDBbot ServHelper Silence tRat TrickBot
2020-05-24 ⋅ Positive Technologies ⋅ PT ESC Threat Intelligence
Operation TA505: network infrastructure. Part 3.
AndroMut Buhtrap SmokeLoader
2020-05-21 ⋅ Intel 471 ⋅ Intel 471
A brief history of TA505
AndroMut Bart Dridex FlawedAmmyy FlawedGrace Gandcrab Get2 GlobeImposter Jaff Kegotip Locky Necurs Philadephia Ransom Pony QuantLoader Rockloader SDBbot ServHelper Shifu Snatch TrickBot
2020-03-03 ⋅ PWC UK ⋅ PWC UK
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 Sea Turtle
2020-02-13 ⋅ Qianxin ⋅ Qi Anxin Threat Intelligence Center
APT Report 2019
Chrysaor Exodus Dacls VPNFilter DNSRat Griffon KopiLuwak More_eggs SQLRat AppleJeus BONDUPDATER Agent.BTZ Anchor AndroMut AppleJeus BOOSTWRITE Brambul Carbanak Cobalt Strike Dacls DistTrack DNSpionage Dtrack ELECTRICFISH FlawedAmmyy FlawedGrace Get2 Grateful POS HOPLIGHT Imminent Monitor RAT jason Joanap KerrDown KEYMARBLE Lambert LightNeuron LoJax MiniDuke PolyglotDuke PowerRatankba Rising Sun SDBbot ServHelper Snatch Stuxnet TinyMet tRat TrickBot Volgmer X-Agent Zebrocy
2019-07-04 ⋅ Trend Micro ⋅ Trend Micro
Latest Spam Campaigns from TA505 Now Using New Malware Tools Gelup and FlowerPippi
AndroMut
2019-07-02 ⋅ Proofpoint ⋅ Dennis Schwarz, Matthew Mesa, Proofpoint Threat Insight Team
TA505 begins summer campaigns with a new pet malware downloader, AndroMut, in the UAE, South Korea, Singapore, and the United States
AndroMut FlawedAmmyy
Yara Rules
[TLP:WHITE] win_andromut_auto (20251219 | Detects win.andromut.)
rule win_andromut_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-01-05"
        version = "1"
        description = "Detects win.andromut."
        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.andromut"
        malpedia_rule_date = "20260105"
        malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79"
        malpedia_version = "20251219"
        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 = { e8???????? 8d8da0dfffff 51 6819000200 56 8d4da4 51 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8d8da0dfffff         | lea                 ecx, [ebp - 0x2060]
            //   51                   | push                ecx
            //   6819000200           | push                0x20019
            //   56                   | push                esi
            //   8d4da4               | lea                 ecx, [ebp - 0x5c]
            //   51                   | push                ecx

        $sequence_1 = { 47 3bfb 72e9 8b75fc 8b45f8 8b7c1018 33db }
            // n = 7, score = 200
            //   47                   | inc                 edi
            //   3bfb                 | cmp                 edi, ebx
            //   72e9                 | jb                  0xffffffeb
            //   8b75fc               | mov                 esi, dword ptr [ebp - 4]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b7c1018             | mov                 edi, dword ptr [eax + edx + 0x18]
            //   33db                 | xor                 ebx, ebx

        $sequence_2 = { 8d8db8f9ffff 51 8d8d70f9ffff 51 57 57 }
            // n = 6, score = 200
            //   8d8db8f9ffff         | lea                 ecx, [ebp - 0x648]
            //   51                   | push                ecx
            //   8d8d70f9ffff         | lea                 ecx, [ebp - 0x690]
            //   51                   | push                ecx
            //   57                   | push                edi
            //   57                   | push                edi

        $sequence_3 = { 53 51 ffb5a0f7ffff 8d8590f7ffff b92d57ae5b 0f438590f7ffff }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   51                   | push                ecx
            //   ffb5a0f7ffff         | push                dword ptr [ebp - 0x860]
            //   8d8590f7ffff         | lea                 eax, [ebp - 0x870]
            //   b92d57ae5b           | mov                 ecx, 0x5bae572d
            //   0f438590f7ffff       | cmovae              eax, dword ptr [ebp - 0x870]

        $sequence_4 = { 8a4d08 8d41bf 3c19 7708 0fbed1 83ea41 eb34 }
            // n = 7, score = 200
            //   8a4d08               | mov                 cl, byte ptr [ebp + 8]
            //   8d41bf               | lea                 eax, [ecx - 0x41]
            //   3c19                 | cmp                 al, 0x19
            //   7708                 | ja                  0xa
            //   0fbed1               | movsx               edx, cl
            //   83ea41               | sub                 edx, 0x41
            //   eb34                 | jmp                 0x36

        $sequence_5 = { 8d44246c b974723dc5 50 8d84247c030000 50 e8???????? }
            // n = 6, score = 200
            //   8d44246c             | lea                 eax, [esp + 0x6c]
            //   b974723dc5           | mov                 ecx, 0xc53d7274
            //   50                   | push                eax
            //   8d84247c030000       | lea                 eax, [esp + 0x37c]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 49 8bc1 c1e10b c1e805 25ff070000 0bc1 }
            // n = 6, score = 200
            //   49                   | dec                 ecx
            //   8bc1                 | mov                 eax, ecx
            //   c1e10b               | shl                 ecx, 0xb
            //   c1e805               | shr                 eax, 5
            //   25ff070000           | and                 eax, 0x7ff
            //   0bc1                 | or                  eax, ecx

        $sequence_7 = { 8b9d70ffffff 8b856cffffff 03df a801 7415 6aff }
            // n = 6, score = 200
            //   8b9d70ffffff         | mov                 ebx, dword ptr [ebp - 0x90]
            //   8b856cffffff         | mov                 eax, dword ptr [ebp - 0x94]
            //   03df                 | add                 ebx, edi
            //   a801                 | test                al, 1
            //   7415                 | je                  0x17
            //   6aff                 | push                -1

        $sequence_8 = { b802210000 6689443e16 0fb7443e06 8b75f8 }
            // n = 4, score = 200
            //   b802210000           | mov                 eax, 0x2102
            //   6689443e16           | mov                 word ptr [esi + edi + 0x16], ax
            //   0fb7443e06           | movzx               eax, word ptr [esi + edi + 6]
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]

        $sequence_9 = { e8???????? 8be5 5d c3 68c8060000 b8???????? e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   68c8060000           | push                0x6c8
            //   b8????????           |                     
            //   e8????????           |                     

    condition:
        7 of them and filesize < 368640
}
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