Analysis

  • max time kernel
    151s
  • max time network
    157s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    21-05-2022 01:41

General

  • Target

    Q2020-07-466am.exe

  • Size

    1.4MB

  • MD5

    93a02efc3319e40884d86f0603d6073d

  • SHA1

    df7966c6dda6c785ad4bcf5b7a49f0a99a9bc51e

  • SHA256

    de7e69ec920dccdc40220e414a2d1b3bc05e53c5f5ea34e309bd3365aa5dae78

  • SHA512

    620172b1822721b279eb1b92d288a2ee82056b77c91c59134edc1aa727524bee2e5211cc41d69e67b1dc1caf9c555e5f475b3fca97d3dd3b94b224443e5fc2c7

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\AEF946DCB4\Log.txt

Family

masslogger

Ransom Note
################################################################# MassLogger v1.3.6.0 ################################################################# ### Logger Details ### User Name: Admin IP: 154.61.71.50 Location: United States Windows OS: Microsoft Windows 7 Ultimate 64bit Windows Serial Key: D4F6K-QK3RD-TMVMJ-BBMRX-3MBMV CPU: Intel Core Processor (Broadwell) GPU: Standard VGA Graphics Adapter AV: NA Screen Resolution: 1280x720 Current Time: 5/21/2022 4:34:41 AM MassLogger Started: 5/21/2022 4:34:26 AM Interval: 2 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe MassLogger Melt: false MassLogger Exit after delivery: false As Administrator: True Processes:

Signatures

  • MassLogger

    Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.

  • MassLogger Main Payload 37 IoCs
  • MassLogger log file 1 IoCs

    Detects a log file produced by MassLogger.

  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Loads dropped DLL 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook profiles 1 TTPs 15 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Q2020-07-466am.exe
    "C:\Users\Admin\AppData\Local\Temp\Q2020-07-466am.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1700
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v chulo /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\chulo.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:856
      • C:\Windows\SysWOW64\reg.exe
        REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v chulo /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\chulo.exe"
        3⤵
        • Adds Run key to start application
        PID:1812
    • C:\Users\Admin\AppData\Roaming\chulo.exe
      "C:\Users\Admin\AppData\Roaming\chulo.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1856
      • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe
        "C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Accesses Microsoft Outlook profiles
        • Suspicious behavior: AddClipboardFormatListener
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • outlook_office_path
        • outlook_win_path
        PID:1512

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe
    Filesize

    40KB

    MD5

    91c9ae9c9a17a9db5e08b120e668c74c

    SHA1

    50770954c1ceb0bb6f1d5d3f2de2a0a065773723

    SHA256

    e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f

    SHA512

    ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e

  • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe
    Filesize

    40KB

    MD5

    91c9ae9c9a17a9db5e08b120e668c74c

    SHA1

    50770954c1ceb0bb6f1d5d3f2de2a0a065773723

    SHA256

    e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f

    SHA512

    ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e

  • C:\Users\Admin\AppData\Roaming\chulo.exe
    Filesize

    1.4MB

    MD5

    93a02efc3319e40884d86f0603d6073d

    SHA1

    df7966c6dda6c785ad4bcf5b7a49f0a99a9bc51e

    SHA256

    de7e69ec920dccdc40220e414a2d1b3bc05e53c5f5ea34e309bd3365aa5dae78

    SHA512

    620172b1822721b279eb1b92d288a2ee82056b77c91c59134edc1aa727524bee2e5211cc41d69e67b1dc1caf9c555e5f475b3fca97d3dd3b94b224443e5fc2c7

  • C:\Users\Admin\AppData\Roaming\chulo.exe
    Filesize

    1.4MB

    MD5

    93a02efc3319e40884d86f0603d6073d

    SHA1

    df7966c6dda6c785ad4bcf5b7a49f0a99a9bc51e

    SHA256

    de7e69ec920dccdc40220e414a2d1b3bc05e53c5f5ea34e309bd3365aa5dae78

    SHA512

    620172b1822721b279eb1b92d288a2ee82056b77c91c59134edc1aa727524bee2e5211cc41d69e67b1dc1caf9c555e5f475b3fca97d3dd3b94b224443e5fc2c7

  • \Users\Admin\AppData\Local\Temp\InstallUtil.exe
    Filesize

    40KB

    MD5

    91c9ae9c9a17a9db5e08b120e668c74c

    SHA1

    50770954c1ceb0bb6f1d5d3f2de2a0a065773723

    SHA256

    e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f

    SHA512

    ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e

  • \Users\Admin\AppData\Roaming\chulo.exe
    Filesize

    1.4MB

    MD5

    93a02efc3319e40884d86f0603d6073d

    SHA1

    df7966c6dda6c785ad4bcf5b7a49f0a99a9bc51e

    SHA256

    de7e69ec920dccdc40220e414a2d1b3bc05e53c5f5ea34e309bd3365aa5dae78

    SHA512

    620172b1822721b279eb1b92d288a2ee82056b77c91c59134edc1aa727524bee2e5211cc41d69e67b1dc1caf9c555e5f475b3fca97d3dd3b94b224443e5fc2c7

  • memory/856-58-0x0000000000000000-mapping.dmp
  • memory/1512-85-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-113-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-596-0x0000000002185000-0x0000000002196000-memory.dmp
    Filesize

    68KB

  • memory/1512-594-0x00000000003B0000-0x00000000003F4000-memory.dmp
    Filesize

    272KB

  • memory/1512-131-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-129-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-68-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-69-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-71-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-72-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-73-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-127-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-74-0x00000000004ACB6E-mapping.dmp
  • memory/1512-77-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-79-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-81-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-83-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-125-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-87-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-89-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-91-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-93-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-95-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-97-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-99-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-101-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-103-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-105-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-107-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-109-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-111-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-123-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-115-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-117-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-119-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1512-121-0x0000000000400000-0x00000000004B2000-memory.dmp
    Filesize

    712KB

  • memory/1700-54-0x0000000000F20000-0x0000000001086000-memory.dmp
    Filesize

    1.4MB

  • memory/1700-55-0x0000000075841000-0x0000000075843000-memory.dmp
    Filesize

    8KB

  • memory/1700-56-0x00000000004F0000-0x000000000050C000-memory.dmp
    Filesize

    112KB

  • memory/1700-57-0x0000000000630000-0x000000000063A000-memory.dmp
    Filesize

    40KB

  • memory/1812-59-0x0000000000000000-mapping.dmp
  • memory/1856-61-0x0000000000000000-mapping.dmp
  • memory/1856-64-0x00000000008F0000-0x0000000000A56000-memory.dmp
    Filesize

    1.4MB