Analysis

  • max time kernel
    147s
  • max time network
    46s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    21-05-2022 12:03

General

  • Target

    DHL_overdue account letter.PDF.exe

  • Size

    424KB

  • MD5

    f0b3e2a7cef0d4e0c6e094676550221a

  • SHA1

    fc8cddcf6526cd3ee94141b6299c7069ad1b19b0

  • SHA256

    6ae9b8c271b5110c7cceb8b7d39522dd8d444dddcfa3691726ff3580562a73b7

  • SHA512

    3a0f6d6e979871ecdf4cce66e63674ecd32568f0d45f91448b0bb986fccbbf3173734f992d6c0add58c5437fd048e36c4b00bd8efcbcf5c161b35b8c7e26178a

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.microtechlab.in
  • Port:
    587
  • Username:
    reports@microtechlab.in
  • Password:
    pune@123

Signatures

  • AgentTesla

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

  • AgentTesla Payload 6 IoCs
  • ReZer0 packer 1 IoCs

    Detects ReZer0, a packer with multiple versions used in various campaigns.

  • Disables Task Manager via registry modification
  • Drops file in Drivers directory 1 IoCs
  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Modifies registry key 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\DHL_overdue account letter.PDF.exe
    "C:\Users\Admin\AppData\Local\Temp\DHL_overdue account letter.PDF.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1992
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\eigBEJpNrvdNDs" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8B5F.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:1820
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
      "{path}"
      2⤵
      • Drops file in Drivers directory
      • Accesses Microsoft Outlook profiles
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • outlook_office_path
      • outlook_win_path
      PID:1632
      • C:\Windows\SysWOW64\REG.exe
        REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
        3⤵
        • Modifies registry key
        PID:892
      • C:\Windows\SysWOW64\netsh.exe
        "netsh" wlan show profile
        3⤵
          PID:1596

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Execution

    Scheduled Task

    1
    T1053

    Persistence

    Registry Run Keys / Startup Folder

    1
    T1060

    Scheduled Task

    1
    T1053

    Privilege Escalation

    Scheduled Task

    1
    T1053

    Defense Evasion

    Modify Registry

    2
    T1112

    Discovery

    System Information Discovery

    1
    T1082

    Collection

    Email Collection

    1
    T1114

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmp8B5F.tmp
      Filesize

      1KB

      MD5

      5c8b4f321a27b321771ffe86a65e4c13

      SHA1

      d0bab6ebb3586c98ca796811592fc7417a0231ac

      SHA256

      3abd5952b758d40d2328e9c4d70333a9eb060f0015510d4b360d71d40d630be0

      SHA512

      a77c1ee60fb81372c394cca297b239e12165e8334da5525ac853a8b7c221929d0fd3b6648b595bba719d201fc02bfc4a528df6e310158fdb1a91be4b26bb45a8

    • memory/892-72-0x0000000000000000-mapping.dmp
    • memory/1596-73-0x0000000000000000-mapping.dmp
    • memory/1632-68-0x0000000000400000-0x0000000000452000-memory.dmp
      Filesize

      328KB

    • memory/1632-60-0x0000000000400000-0x0000000000452000-memory.dmp
      Filesize

      328KB

    • memory/1632-61-0x0000000000400000-0x0000000000452000-memory.dmp
      Filesize

      328KB

    • memory/1632-63-0x0000000000400000-0x0000000000452000-memory.dmp
      Filesize

      328KB

    • memory/1632-64-0x0000000000400000-0x0000000000452000-memory.dmp
      Filesize

      328KB

    • memory/1632-65-0x0000000000400000-0x0000000000452000-memory.dmp
      Filesize

      328KB

    • memory/1632-66-0x000000000044CF5E-mapping.dmp
    • memory/1632-70-0x0000000000400000-0x0000000000452000-memory.dmp
      Filesize

      328KB

    • memory/1820-58-0x0000000000000000-mapping.dmp
    • memory/1992-57-0x00000000751C1000-0x00000000751C3000-memory.dmp
      Filesize

      8KB

    • memory/1992-54-0x00000000012A0000-0x0000000001310000-memory.dmp
      Filesize

      448KB

    • memory/1992-56-0x0000000000B80000-0x0000000000BD8000-memory.dmp
      Filesize

      352KB

    • memory/1992-55-0x0000000000260000-0x0000000000268000-memory.dmp
      Filesize

      32KB