Analysis

  • max time kernel
    139s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    08-07-2022 06:10

General

  • Target

    UnRAR.exe

  • Size

    343KB

  • MD5

    61719f5c7a2b004e5eeeb736432259cc

  • SHA1

    ed6c92d8888d90b881f503129059eab6afadaae2

  • SHA256

    c3c986d91d89bb66a99e6de6f19b1590a4e56534724c0a453b482c8f68886c94

  • SHA512

    68b2947708523005c29e2d8cf9614f78ae39dd745acd15d0279bc6193dd20cc1051956dcd4660eeac843cadef1ece30ae1af576de9da2503cb9730f2bdda66ee

Malware Config

Signatures

  • Ramnit

    Ramnit is a versatile family that holds viruses, worms, and Trojans.

  • Executes dropped EXE 2 IoCs
  • UPX packed file 6 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Drops file in Program Files directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies Internet Explorer settings 1 TTPs 47 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 6 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\UnRAR.exe
    "C:\Users\Admin\AppData\Local\Temp\UnRAR.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4984
    • C:\Users\Admin\AppData\Local\Temp\UnRARSrv.exe
      C:\Users\Admin\AppData\Local\Temp\UnRARSrv.exe
      2⤵
      • Executes dropped EXE
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:2320
      • C:\Program Files (x86)\Microsoft\DesktopLayer.exe
        "C:\Program Files (x86)\Microsoft\DesktopLayer.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:656
        • C:\Program Files\Internet Explorer\iexplore.exe
          "C:\Program Files\Internet Explorer\iexplore.exe"
          4⤵
          • Modifies Internet Explorer settings
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:1200
          • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
            "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1200 CREDAT:17410 /prefetch:2
            5⤵
            • Modifies Internet Explorer settings
            • Suspicious use of SetWindowsHookEx
            PID:1956

Network

MITRE ATT&CK Matrix ATT&CK v6

Defense Evasion

Modify Registry

1
T1112

Discovery

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Program Files (x86)\Microsoft\DesktopLayer.exe
    Filesize

    55KB

    MD5

    ff5e1f27193ce51eec318714ef038bef

    SHA1

    b4fa74a6f4dab3a7ba702b6c8c129f889db32ca6

    SHA256

    fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320

    SHA512

    c9d654ead35f40eea484a3dc5b5d0a44294b9e7b41a9bacdafdd463d3de9daa2a43237a5f113f6a9c8ea5e1366823fd3d83da18cd8197aa69a55e9f345512a7a

  • C:\Program Files (x86)\Microsoft\DesktopLayer.exe
    Filesize

    55KB

    MD5

    ff5e1f27193ce51eec318714ef038bef

    SHA1

    b4fa74a6f4dab3a7ba702b6c8c129f889db32ca6

    SHA256

    fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320

    SHA512

    c9d654ead35f40eea484a3dc5b5d0a44294b9e7b41a9bacdafdd463d3de9daa2a43237a5f113f6a9c8ea5e1366823fd3d83da18cd8197aa69a55e9f345512a7a

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\7423F88C7F265F0DEFC08EA88C3BDE45_AA1E8580D4EBC816148CE81268683776
    Filesize

    471B

    MD5

    792d1cce1523ee29fa8eac86e4ad0b5d

    SHA1

    dbea5ff511dc06e72abc982c287a831385ecaf54

    SHA256

    a852ffad56b7ca65729a0311c4056024f5e6becbae353a4cf83a560cecd7399d

    SHA512

    199cde64a2cf0064a8786cd1fb544f225dd42b90b78013e97b238daebe8e641e716be51ae8840fd6def08d50242abdb68732e126160cc66d9bb7a0e4e3386631

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\7423F88C7F265F0DEFC08EA88C3BDE45_AA1E8580D4EBC816148CE81268683776
    Filesize

    404B

    MD5

    8abdf0f6dcb54b30dd4afa39cd4cf3f7

    SHA1

    f5a80c210c5fc9134a28e9244b648ef36c25f3d2

    SHA256

    57ef46e96ee48377d9dcf42ca135d2daa2fca579f41b79205237be9a7cd091b6

    SHA512

    1bdecacfb03d813431e83179b0e1f2ae79c18b372d69b2a6aab0c6f7e4c9830aaaff98da77f65dc57b99662559cbf8b66da2c5fb4793d3b255e289baba8b7a67

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

    55KB

    MD5

    ff5e1f27193ce51eec318714ef038bef

    SHA1

    b4fa74a6f4dab3a7ba702b6c8c129f889db32ca6

    SHA256

    fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320

    SHA512

    c9d654ead35f40eea484a3dc5b5d0a44294b9e7b41a9bacdafdd463d3de9daa2a43237a5f113f6a9c8ea5e1366823fd3d83da18cd8197aa69a55e9f345512a7a

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

    55KB

    MD5

    ff5e1f27193ce51eec318714ef038bef

    SHA1

    b4fa74a6f4dab3a7ba702b6c8c129f889db32ca6

    SHA256

    fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320

    SHA512

    c9d654ead35f40eea484a3dc5b5d0a44294b9e7b41a9bacdafdd463d3de9daa2a43237a5f113f6a9c8ea5e1366823fd3d83da18cd8197aa69a55e9f345512a7a

  • memory/656-134-0x0000000000000000-mapping.dmp
  • memory/656-138-0x0000000000400000-0x000000000042E000-memory.dmp
    Filesize

    184KB

  • memory/2320-131-0x0000000000000000-mapping.dmp
  • memory/2320-137-0x0000000000400000-0x000000000042E000-memory.dmp
    Filesize

    184KB

  • memory/4984-130-0x0000000000980000-0x00000000009EF000-memory.dmp
    Filesize

    444KB

  • memory/4984-139-0x0000000000980000-0x00000000009EF000-memory.dmp
    Filesize

    444KB