Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    26-11-2024 23:14

General

  • Target

    AA_v3.exe

  • Size

    774KB

  • MD5

    79910ca3e3418acca4fa2f2e16bac1a3

  • SHA1

    e2619c3d2580aa37c579835fdd3c5efee3f22412

  • SHA256

    7aeab9459e2a833d56e474a23ab56bc66645a89ff8ef175050d8b0bed74d090e

  • SHA512

    0e5ae373f2c1f9c8ba03338c2b5c520c6c1b1fa6ad38bcfa52f926634e1f65fac1cbd50af96c6e4d873424c38a1dd4c985d5fdc5de12a5827c76852340bffb5a

  • SSDEEP

    12288:/Xe1Z2fJipMHEgSeA6M7kmchJGvRuORtcE9qTpy+Yg0HkV+QgM:ftkmHEgSewkmchJGsORtn9qT8+Yg03FM

Malware Config

Signatures

  • FlawedAmmyy RAT

    Remote-access trojan based on leaked code for the Ammyy remote admin software.

  • Flawedammyy family
  • Blocklisted process makes network request 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Loads dropped DLL 4 IoCs
  • Drops file in System32 directory 5 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 64 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 46 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
    "C:\Users\Admin\AppData\Local\Temp\AA_v3.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    PID:1656
  • C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
    "C:\Users\Admin\AppData\Local\Temp\AA_v3.exe" -service -lunch
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1428
    • C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
      "C:\Users\Admin\AppData\Local\Temp\AA_v3.exe"
      2⤵
      • Checks computer location settings
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      • Modifies system certificate store
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:2148
      • C:\Windows\system32\rundll32.exe
        rundll32.exe "C:\ProgramData\AMMYY\aa_nts.dll",run
        3⤵
        • Blocklisted process makes network request
        • Loads dropped DLL
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2780

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\ProgramData\AMMYY\aa_nts.dll

    Filesize

    902KB

    MD5

    480a66902e6e7cdafaa6711e8697ff8c

    SHA1

    6ac730962e7c1dba9e2ecc5733a506544f3c8d11

    SHA256

    7eaaaa6010bbcd6bb8c9ad08d4b0966c7aedc9b2ac24758f170012ac36e508b5

    SHA512

    7d010cd47b7d1adf66f9c97afc6c3805997aa5c7cc6ff13eddee81f24cf2b95a3fe375ec5b3d6185c0bc8840b4ad91ae143c73a39af26391cc182ab6a1793ba5

  • C:\ProgramData\AMMYY\aa_nts.log

    Filesize

    4KB

    MD5

    7a56abab2953f72fbb5d3610790e1176

    SHA1

    9018d391976df9699394930e76075e677b07ada5

    SHA256

    c40116af40f4d532ad6580d0efcc8184c1c22fc65a10d3b61e47dfe9a4df7bc8

    SHA512

    1a32844d39b4196134d93a73a25d708e2b3062dc0a3e1930087b507eb9148903d2f0834e82c70621e4ccc53655c3d5484a69761366a52b6c93a2fbbb5bd08d83

  • C:\ProgramData\AMMYY\aa_nts.msg

    Filesize

    45B

    MD5

    f5d867c23b8cac17baecc8cd2ac118b9

    SHA1

    ab0da5d10496611ae18f28822c32507aa531dfc4

    SHA256

    52ebeac5f05e8e12afb680e5e291b41a440cc7dbb812fddd075b6f7586c4fd2b

    SHA512

    1a067037fb1a8f6782681902e6dc391e399c5caf3e430bdacc30d2cd36985d4eff72359d676e7799dbac3f2f58f697181934a67af18a366cb58a69e6f56e837d

  • C:\ProgramData\AMMYY\settings3.bin

    Filesize

    280B

    MD5

    542835956a0ff5490c297efa14b3c1d3

    SHA1

    433d62823acc56546a2389b814067cc0771ac8dc

    SHA256

    06d265cab42ce567749866bfbc9378f018101196cbea28cddc1ecd2e0b42fa87

    SHA512

    34384f243c7c04a761fa24288f65ff5ea6b9115a53ddecaf9707b11b700cdd3113a06eb9c11b7c7f69771352ca81d0a014825b2b515ae88557f6dfef94bb8414

  • memory/2780-20-0x0000000064200000-0x00000000642EE000-memory.dmp

    Filesize

    952KB

  • memory/2780-34-0x0000000064200000-0x00000000642EE000-memory.dmp

    Filesize

    952KB

  • memory/2780-45-0x0000000064200000-0x00000000642EE000-memory.dmp

    Filesize

    952KB

  • memory/2780-54-0x0000000064200000-0x00000000642EE000-memory.dmp

    Filesize

    952KB

  • memory/2780-61-0x0000000064200000-0x00000000642EE000-memory.dmp

    Filesize

    952KB

  • memory/2780-69-0x0000000064200000-0x00000000642EE000-memory.dmp

    Filesize

    952KB

  • memory/2780-76-0x0000000064200000-0x00000000642EE000-memory.dmp

    Filesize

    952KB

  • memory/2780-84-0x0000000064200000-0x00000000642EE000-memory.dmp

    Filesize

    952KB