Analysis

  • max time kernel
    144s
  • max time network
    136s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    08-02-2022 09:03

General

  • Target

    b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe

  • Size

    610KB

  • MD5

    b3a27137bfa9f92fe6b4cc7f0aaf08f4

  • SHA1

    266e5d674bd1fe6135bd74658bb8a1d58777bbe0

  • SHA256

    37c712662321d51383b50cc3973ba187706384859c6ff4f9e43e8be3c9e6dfe4

  • SHA512

    2aec6a1ffd6a1df55ca456ed80b42b28f10f98ab11ab1cfefad29529037e433a7cb527ab081fbcddcf38c70adf2b0bbb484e936f42a5720fbfc2943b7d96a37a

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    ftp
  • Host:
    ftp://nanyainc.cf/
  • Port:
    21
  • Username:
    [email protected]
  • Password:
    7qB+iH=KrUUT

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • Modifies system executable filetype association 2 TTPs 1 IoCs
  • Neshta

    Malware from the neshta family is designed to infect itself into other files to spread itself and cause damage.

  • AgentTesla Payload 4 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 3 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 13 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe
    "C:\Users\Admin\AppData\Local\Temp\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe"
    1⤵
    • Modifies system executable filetype association
    • Loads dropped DLL
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1744
    • C:\Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe
      "C:\Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:432
      • C:\Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe
        "C:\Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1200

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe
    MD5

    cc2133f03997221244a4a684e8826f26

    SHA1

    6ec6ffa9180b886fdfd0fa8cdeabbbd3c4391737

    SHA256

    4b17ac7e6e9b1dc14be2216ce0ff5ba66c80e0aed3c680e5269b875f914ee65c

    SHA512

    d7b537fe99caa57b36a025bc750ee3f7c2187bab555148768799f48615cdd14c41394bfdca6f2e810b085a6a7982b44c2aec70fa202bb716f248e5f4f4105f91

  • C:\Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe
    MD5

    cc2133f03997221244a4a684e8826f26

    SHA1

    6ec6ffa9180b886fdfd0fa8cdeabbbd3c4391737

    SHA256

    4b17ac7e6e9b1dc14be2216ce0ff5ba66c80e0aed3c680e5269b875f914ee65c

    SHA512

    d7b537fe99caa57b36a025bc750ee3f7c2187bab555148768799f48615cdd14c41394bfdca6f2e810b085a6a7982b44c2aec70fa202bb716f248e5f4f4105f91

  • C:\Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe
    MD5

    cc2133f03997221244a4a684e8826f26

    SHA1

    6ec6ffa9180b886fdfd0fa8cdeabbbd3c4391737

    SHA256

    4b17ac7e6e9b1dc14be2216ce0ff5ba66c80e0aed3c680e5269b875f914ee65c

    SHA512

    d7b537fe99caa57b36a025bc750ee3f7c2187bab555148768799f48615cdd14c41394bfdca6f2e810b085a6a7982b44c2aec70fa202bb716f248e5f4f4105f91

  • \PROGRA~2\Adobe\READER~1.0\Reader\LOGTRA~1.EXE
    MD5

    9e2b9928c89a9d0da1d3e8f4bd96afa7

    SHA1

    ec66cda99f44b62470c6930e5afda061579cde35

    SHA256

    8899b4ed3446b7d55b54defbc1acb7c5392a4b3bc8ec2cdc7c31171708965043

    SHA512

    2ca5ad1d0e12a8049de885b90b7f56fe77c868e0d6dae4ec4b6f3bc0bf7b2e73295cc9b1328c2b45357ffb0d7804622ab3f91a56140b098e93b691032d508156

  • \Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe
    MD5

    cc2133f03997221244a4a684e8826f26

    SHA1

    6ec6ffa9180b886fdfd0fa8cdeabbbd3c4391737

    SHA256

    4b17ac7e6e9b1dc14be2216ce0ff5ba66c80e0aed3c680e5269b875f914ee65c

    SHA512

    d7b537fe99caa57b36a025bc750ee3f7c2187bab555148768799f48615cdd14c41394bfdca6f2e810b085a6a7982b44c2aec70fa202bb716f248e5f4f4105f91

  • \Users\Admin\AppData\Local\Temp\3582-490\b3a27137bfa9f92fe6b4cc7f0aaf08f4.exe
    MD5

    cc2133f03997221244a4a684e8826f26

    SHA1

    6ec6ffa9180b886fdfd0fa8cdeabbbd3c4391737

    SHA256

    4b17ac7e6e9b1dc14be2216ce0ff5ba66c80e0aed3c680e5269b875f914ee65c

    SHA512

    d7b537fe99caa57b36a025bc750ee3f7c2187bab555148768799f48615cdd14c41394bfdca6f2e810b085a6a7982b44c2aec70fa202bb716f248e5f4f4105f91

  • memory/432-59-0x0000000073B30000-0x000000007421E000-memory.dmp
    Filesize

    6.9MB

  • memory/432-60-0x0000000000980000-0x0000000000A14000-memory.dmp
    Filesize

    592KB

  • memory/432-63-0x0000000004DF0000-0x0000000004DF1000-memory.dmp
    Filesize

    4KB

  • memory/432-64-0x0000000004A40000-0x0000000004AB0000-memory.dmp
    Filesize

    448KB

  • memory/432-61-0x00000000002F0000-0x00000000002FC000-memory.dmp
    Filesize

    48KB

  • memory/1200-68-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1200-66-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1200-67-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1200-70-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1200-69-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1200-72-0x0000000000400000-0x000000000043C000-memory.dmp
    Filesize

    240KB

  • memory/1200-73-0x0000000073B30000-0x000000007421E000-memory.dmp
    Filesize

    6.9MB

  • memory/1200-74-0x0000000004AB0000-0x0000000004AB1000-memory.dmp
    Filesize

    4KB

  • memory/1744-55-0x0000000075191000-0x0000000075193000-memory.dmp
    Filesize

    8KB