Analysis

  • max time kernel
    148s
  • max time network
    157s
  • platform
    windows7_x64
  • resource
    win7v200430
  • submitted
    31-05-2020 23:07

General

  • Target

    gstyrsOisyc.exe

  • Size

    243KB

  • MD5

    b07161e4af167724951c08af34ab15c4

  • SHA1

    2a4923f495db2cf4a319b86af521113c7bc686be

  • SHA256

    f851ed64ceaef079573d0f37c083d08d487055c90e2e8b0f6514fe261f4a23f1

  • SHA512

    393fa8813ef3a6d96f820cb5b0879f2a31e8c6b049f1e726c47bef870d01208987fede64bd8d3772714f157bdf386b28b6eef5268a6a6eb6f738ccf92da06bf5

Malware Config

Signatures

  • Suspicious use of WriteProcessMemory 8 IoCs
  • Suspicious use of SetWindowsHookEx 28 IoCs
  • Suspicious use of FindShellTrayWindow 7 IoCs
  • Ursnif RM3

    A heavily modified version of Ursnif discovered in the wild.

  • Checks whether UAC is enabled 3 IoCs
  • Modifies Internet Explorer settings 1 TTPs 37 IoCs
  • Modifies system certificate store 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\gstyrsOisyc.exe
    "C:\Users\Admin\AppData\Local\Temp\gstyrsOisyc.exe"
    1⤵
      PID:288
    • C:\Program Files\Internet Explorer\iexplore.exe
      "C:\Program Files\Internet Explorer\iexplore.exe" -Embedding
      1⤵
      • Suspicious use of WriteProcessMemory
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of FindShellTrayWindow
      • Checks whether UAC is enabled
      • Modifies Internet Explorer settings
      PID:1500
      • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
        "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1500 CREDAT:275457 /prefetch:2
        2⤵
        • Suspicious use of SetWindowsHookEx
        • Checks whether UAC is enabled
        • Modifies Internet Explorer settings
        • Modifies system certificate store
        PID:1724
      • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
        "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1500 CREDAT:472082 /prefetch:2
        2⤵
        • Suspicious use of SetWindowsHookEx
        • Checks whether UAC is enabled
        • Modifies Internet Explorer settings
        • Modifies system certificate store
        PID:1628

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Defense Evasion

    Modify Registry

    1
    T1112

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\E49827401028F7A0F97B5576C77A26CB_7CE95D8DCA26FE957E7BD7D76F353B08
    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\E49827401028F7A0F97B5576C77A26CB_7CE95D8DCA26FE957E7BD7D76F353B08
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Cookies\ELICI2CC.txt
    • memory/288-0-0x00000000003F0000-0x0000000000400000-memory.dmp
      Filesize

      64KB

    • memory/1628-5-0x0000000004120000-0x0000000004123000-memory.dmp
      Filesize

      12KB

    • memory/1724-6-0x0000000002630000-0x0000000002631000-memory.dmp
      Filesize

      4KB

    • memory/1724-9-0x0000000002630000-0x0000000002631000-memory.dmp
      Filesize

      4KB

    • memory/1724-11-0x0000000002630000-0x0000000002631000-memory.dmp
      Filesize

      4KB

    • memory/1724-7-0x0000000002630000-0x0000000002631000-memory.dmp
      Filesize

      4KB

    • memory/1724-18-0x0000000002630000-0x0000000002632000-memory.dmp
      Filesize

      8KB

    • memory/1724-33-0x0000000002640000-0x0000000002642000-memory.dmp
      Filesize

      8KB

    • memory/1724-35-0x0000000002640000-0x0000000002642000-memory.dmp
      Filesize

      8KB