Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    06-02-2022 22:36

General

  • Target

    po-202103.exe

  • Size

    1.1MB

  • MD5

    83565d8eac8fbbc1b5392913e329397e

  • SHA1

    1795fa118fe0484f3238d94207946a988d6ad97a

  • SHA256

    787760272209442be52c110ab48a8af7b6d504725708750685275ccdee2807ec

  • SHA512

    9930aa82eec1ce8a046ff194d7ba45b24879f45a594356e325ea04614bd3d8001154da7c1f03074c2905c32750b0f4e1caf92dca86c05ccc2e77b81114721990

Malware Config

Signatures

  • Taurus Stealer

    Taurus is an infostealer first seen in June 2020.

  • Taurus Stealer Payload 5 IoCs
  • Looks for VirtualBox Guest Additions in registry 2 TTPs
  • Looks for VMWare Tools registry key 2 TTPs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

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

  • Maps connected drives based on registry 3 TTPs 2 IoCs

    Disk information is often read in order to detect sandboxing environments.

  • 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.

  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\po-202103.exe
    "C:\Users\Admin\AppData\Local\Temp\po-202103.exe"
    1⤵
    • Checks BIOS information in registry
    • Maps connected drives based on registry
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2028
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\YNzYyntiwSm" /XML "C:\Users\Admin\AppData\Local\Temp\tmp82B6.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:1544
    • C:\Users\Admin\AppData\Local\Temp\po-202103.exe
      "C:\Users\Admin\AppData\Local\Temp\po-202103.exe"
      2⤵
        PID:756

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmp82B6.tmp

      MD5

      473715d7d59a5b35c2e89d9ac4e81ffa

      SHA1

      a3f89a904121e70b4bf1540af1141860f934461d

      SHA256

      1307b27071e4aff53304de12942d3adc65fae314410089cb5024e374c0b06bae

      SHA512

      6fe4fdb5796adfa6244894b6ba6e4d3bf13249dc7b6310d765f07c353efff03e17105b83940dd7c59018eff6aac38949af11cc310fa79a7d3b25b3a63f386f47

    • memory/756-63-0x0000000000400000-0x000000000043A000-memory.dmp

      Filesize

      232KB

    • memory/756-60-0x0000000000400000-0x000000000043A000-memory.dmp

      Filesize

      232KB

    • memory/756-61-0x0000000000400000-0x000000000043A000-memory.dmp

      Filesize

      232KB

    • memory/756-62-0x0000000000400000-0x000000000043A000-memory.dmp

      Filesize

      232KB

    • memory/756-64-0x0000000000400000-0x000000000043A000-memory.dmp

      Filesize

      232KB

    • memory/756-65-0x0000000000400000-0x000000000043A000-memory.dmp

      Filesize

      232KB

    • memory/756-67-0x0000000000400000-0x000000000043A000-memory.dmp

      Filesize

      232KB

    • memory/2028-56-0x0000000000480000-0x000000000048E000-memory.dmp

      Filesize

      56KB

    • memory/2028-57-0x0000000000A30000-0x0000000000A31000-memory.dmp

      Filesize

      4KB

    • memory/2028-58-0x0000000000D50000-0x0000000000DB6000-memory.dmp

      Filesize

      408KB

    • memory/2028-55-0x0000000075191000-0x0000000075193000-memory.dmp

      Filesize

      8KB

    • memory/2028-54-0x0000000001040000-0x0000000001154000-memory.dmp

      Filesize

      1.1MB