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Resubmissions

11/01/2025, 16:38

250111-t5wxbawmhj 10

11/01/2025, 16:18

250111-tr266stjdz 10

Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    11/01/2025, 16:18

General

  • Target

    MicroStrap.exe

  • Size

    74KB

  • MD5

    9785b81af0d8b024dadd31659a3a2d24

  • SHA1

    14f4539dc755b69ad28f9c1953aeec3620669588

  • SHA256

    fec63e2ee9e830df5298bd72464fe6753a60a5ef14bd3023e9ab99260878b3df

  • SHA512

    002df3d93cde212d4a9678f167201599d5e874defe15f2e46494d72f442692bf62a8fcfa226963f0575335f0b1062a61508ca143b95614eef4a6d7cd563c5120

  • SSDEEP

    1536:OUKkcx9pXCTyPMVEZ8kyIgH1bO/zeoBDQzcOLVclN:OUDcx958yPMVEZ81H1bOLRDQHBY

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

C2

195.88.218.126:2404

Mutex

rnxgsvfqmra

Attributes
  • delay

    1

  • install

    true

  • install_file

    svchost.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Asyncrat family
  • Async RAT payload 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Delays execution with timeout.exe 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 33 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\MicroStrap.exe
    "C:\Users\Admin\AppData\Local\Temp\MicroStrap.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1800
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2588
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2808
    • C:\Windows\system32\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpA026.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1724
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:2716
      • C:\Users\Admin\AppData\Roaming\svchost.exe
        "C:\Users\Admin\AppData\Roaming\svchost.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        PID:2884

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\CabBA3D.tmp

    Filesize

    70KB

    MD5

    49aebf8cbd62d92ac215b2923fb1b9f5

    SHA1

    1723be06719828dda65ad804298d0431f6aff976

    SHA256

    b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

    SHA512

    bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

  • C:\Users\Admin\AppData\Local\Temp\TarD177.tmp

    Filesize

    181KB

    MD5

    4ea6026cf93ec6338144661bf1202cd1

    SHA1

    a1dec9044f750ad887935a01430bf49322fbdcb7

    SHA256

    8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

    SHA512

    6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

  • C:\Users\Admin\AppData\Local\Temp\tmpA026.tmp.bat

    Filesize

    151B

    MD5

    fdcc7224942c1f512a114a597e449f7e

    SHA1

    4caf1a383eb628f8dcbeba59b9d2c3cda75542d9

    SHA256

    d63f25ace2587c55f59ecd839c7f77d21537a9d42efd5247525fdc50bf26b3f9

    SHA512

    4d67b79ca3786f7d843e03c2a9ea99532dafb67ddbbe282c08efda9b5e1b907f3e2cfa310a28b1d4b7a7b4e624688a3580a15c543b3343795a458ffd1d98de81

  • C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

    Filesize

    8B

    MD5

    cf759e4c5f14fe3eec41b87ed756cea8

    SHA1

    c27c796bb3c2fac929359563676f4ba1ffada1f5

    SHA256

    c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

    SHA512

    c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

  • C:\Users\Admin\AppData\Roaming\svchost.exe

    Filesize

    74KB

    MD5

    9785b81af0d8b024dadd31659a3a2d24

    SHA1

    14f4539dc755b69ad28f9c1953aeec3620669588

    SHA256

    fec63e2ee9e830df5298bd72464fe6753a60a5ef14bd3023e9ab99260878b3df

    SHA512

    002df3d93cde212d4a9678f167201599d5e874defe15f2e46494d72f442692bf62a8fcfa226963f0575335f0b1062a61508ca143b95614eef4a6d7cd563c5120

  • memory/1800-0-0x000007FEF58D3000-0x000007FEF58D4000-memory.dmp

    Filesize

    4KB

  • memory/1800-1-0x0000000000030000-0x0000000000048000-memory.dmp

    Filesize

    96KB

  • memory/1800-3-0x000007FEF58D0000-0x000007FEF62BC000-memory.dmp

    Filesize

    9.9MB

  • memory/1800-12-0x000007FEF58D0000-0x000007FEF62BC000-memory.dmp

    Filesize

    9.9MB

  • memory/1800-13-0x000007FEF58D0000-0x000007FEF62BC000-memory.dmp

    Filesize

    9.9MB

  • memory/2884-18-0x0000000000080000-0x0000000000098000-memory.dmp

    Filesize

    96KB