Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    19-04-2021 00:06

General

  • Target

    SERFINANZAEXTRACTO283816558547438357773985414.exe

  • Size

    128KB

  • MD5

    b82490dbb12159cc752ec64995dd7348

  • SHA1

    efffc1c5cb6674da0fa4ea282cb7029284a49bef

  • SHA256

    ae0e4f562ecbe6754699d92948d01d4080401d92bb2778e0d2f2ca7caf787cee

  • SHA512

    49823e6a327d9540bf4ca8a31e8abf598ce27a8d7fb6a12ee6f86e9d2c170877eb4c4b73ada4864d3bdf91b50673a9d7b504ba1e01f24401391d5cb4775f9218

Score
10/10

Malware Config

Extracted

Family

remcos

C2

databasepropersonombrecomercialideasearchwords.services:3521

Signatures

  • Remcos

    Remcos is a closed-source remote control and surveillance software.

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 34 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\SERFINANZAEXTRACTO283816558547438357773985414.exe
    "C:\Users\Admin\AppData\Local\Temp\SERFINANZAEXTRACTO283816558547438357773985414.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:772
    • C:\Users\Admin\AppData\Local\Temp\SERFINANZAEXTRACTO283816558547438357773985414.exe
      "C:\Users\Admin\AppData\Local\Temp\SERFINANZAEXTRACTO283816558547438357773985414.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:1680
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1972
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe"
          4⤵
          • Loads dropped DLL
          • Suspicious use of WriteProcessMemory
          PID:1032
          • C:\Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe
            C:\Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:1064
            • C:\Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe
              "C:\Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe"
              6⤵
              • Executes dropped EXE
              • Adds Run key to start application
              • Suspicious use of SetWindowsHookEx
              PID:1036

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

1
T1112

Discovery

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\install.vbs
    MD5

    a39af763b1c09ead3c98a6a615f377fe

    SHA1

    9bd3d39c89e47fe7072270ecc80b810103235c03

    SHA256

    a3930d7535eb768523ee52bbe69f13f857a0ae0f982d7bfc354d802f21010f8f

    SHA512

    3ed8e33ac95fd2536286b4afb2ed2a082bb5f98843478262b32263a14a5dbe0425de7b8d9662a5e482b207ebf8484ace8009ecd1881a6f6f8b0ccf3b0fdfe5da

  • C:\Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe
    MD5

    b82490dbb12159cc752ec64995dd7348

    SHA1

    efffc1c5cb6674da0fa4ea282cb7029284a49bef

    SHA256

    ae0e4f562ecbe6754699d92948d01d4080401d92bb2778e0d2f2ca7caf787cee

    SHA512

    49823e6a327d9540bf4ca8a31e8abf598ce27a8d7fb6a12ee6f86e9d2c170877eb4c4b73ada4864d3bdf91b50673a9d7b504ba1e01f24401391d5cb4775f9218

  • C:\Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe
    MD5

    b82490dbb12159cc752ec64995dd7348

    SHA1

    efffc1c5cb6674da0fa4ea282cb7029284a49bef

    SHA256

    ae0e4f562ecbe6754699d92948d01d4080401d92bb2778e0d2f2ca7caf787cee

    SHA512

    49823e6a327d9540bf4ca8a31e8abf598ce27a8d7fb6a12ee6f86e9d2c170877eb4c4b73ada4864d3bdf91b50673a9d7b504ba1e01f24401391d5cb4775f9218

  • C:\Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe
    MD5

    b82490dbb12159cc752ec64995dd7348

    SHA1

    efffc1c5cb6674da0fa4ea282cb7029284a49bef

    SHA256

    ae0e4f562ecbe6754699d92948d01d4080401d92bb2778e0d2f2ca7caf787cee

    SHA512

    49823e6a327d9540bf4ca8a31e8abf598ce27a8d7fb6a12ee6f86e9d2c170877eb4c4b73ada4864d3bdf91b50673a9d7b504ba1e01f24401391d5cb4775f9218

  • C:\Users\Admin\BHiwEJzokphisxwVQeIvLHPlmwIciqEF
    MD5

    9e62e15fa6152d20a1d9fcf38928d48e

    SHA1

    4a42f478a386e7738cefa26f8aea411fbf58cdaa

    SHA256

    aff9cefa4bf54bd9347563ddfd3c94266ad5e91fa8126ef4fb18ba267710f733

    SHA512

    085ec1924a98d64e5ff6bca1716d489e67d45cca521db38d0ed528a6d95c91924a3e7bba17e9112d1c22140be7415f6fd32f989fdbffb3f3df1dd7bbbf8f41c5

  • \Users\Admin\AppData\Roaming\System32\PxxoServicesTrialNet1.exe
    MD5

    b82490dbb12159cc752ec64995dd7348

    SHA1

    efffc1c5cb6674da0fa4ea282cb7029284a49bef

    SHA256

    ae0e4f562ecbe6754699d92948d01d4080401d92bb2778e0d2f2ca7caf787cee

    SHA512

    49823e6a327d9540bf4ca8a31e8abf598ce27a8d7fb6a12ee6f86e9d2c170877eb4c4b73ada4864d3bdf91b50673a9d7b504ba1e01f24401391d5cb4775f9218

  • memory/772-63-0x0000000001080000-0x0000000001081000-memory.dmp
    Filesize

    4KB

  • memory/772-64-0x0000000000450000-0x000000000047C000-memory.dmp
    Filesize

    176KB

  • memory/772-62-0x0000000075EF1000-0x0000000075EF3000-memory.dmp
    Filesize

    8KB

  • memory/772-60-0x0000000001110000-0x0000000001111000-memory.dmp
    Filesize

    4KB

  • memory/1032-72-0x0000000000000000-mapping.dmp
  • memory/1036-84-0x0000000000413FA4-mapping.dmp
  • memory/1036-87-0x0000000000400000-0x0000000000422000-memory.dmp
    Filesize

    136KB

  • memory/1064-75-0x0000000000000000-mapping.dmp
  • memory/1064-82-0x0000000004B90000-0x0000000004B91000-memory.dmp
    Filesize

    4KB

  • memory/1064-77-0x0000000000A90000-0x0000000000A91000-memory.dmp
    Filesize

    4KB

  • memory/1680-65-0x0000000000400000-0x0000000000422000-memory.dmp
    Filesize

    136KB

  • memory/1680-66-0x0000000000413FA4-mapping.dmp
  • memory/1680-71-0x0000000000400000-0x0000000000422000-memory.dmp
    Filesize

    136KB

  • memory/1972-68-0x0000000000000000-mapping.dmp