Analysis

  • max time kernel
    227s
  • max time network
    241s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    20-05-2022 12:56

General

  • Target

    Parcel receipt.scr

  • Size

    928KB

  • MD5

    cce93b0317a848c601a12f2a3c3cd14f

  • SHA1

    7f3bb0b8c36cbab52de216b69fe1ede97b1f6899

  • SHA256

    7e1aedab87d6c23e82dd24f2a1975da18d252d5646365a5776a7f3089268c946

  • SHA512

    f2977f53388a3145fc734cc6747b58a73a879247a6ab14495d96cea7b45531579bde773f5e6f0ed76dcac68903b9467d287421045f9cf507e4be332aa1d1aa78

Malware Config

Extracted

Family

limerat

Attributes
  • aes_key

    123456789

  • antivm

    false

  • c2_url

    https://pastebin.com/raw/5cXHFyui

  • delay

    3

  • download_payload

    false

  • install

    true

  • install_name

    Wservices.exe

  • main_folder

    Temp

  • pin_spread

    false

  • sub_folder

    \

  • usb_spread

    false

Signatures

  • LimeRAT

    Simple yet powerful RAT for Windows machines written in .NET.

  • Disables Task Manager via registry modification
  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Adds Run key to start application 2 TTPs 2 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.

  • Suspicious behavior: EnumeratesProcesses 18 IoCs
  • Suspicious use of WriteProcessMemory 35 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Parcel receipt.scr
    "C:\Users\Admin\AppData\Local\Temp\Parcel receipt.scr" /S
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4928
    • C:\Users\Admin\AppData\Roaming\43486004\thaepnern.pif
      "C:\Users\Admin\AppData\Roaming\43486004\thaepnern.pif" jvganwua.cvm
      2⤵
      • Executes dropped EXE
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4884
      • C:\Windows\SysWOW64\mshta.exe
        "C:\Windows\SysWOW64\mshta.exe"
        3⤵
          PID:3476
        • C:\Windows\SysWOW64\mshta.exe
          "C:\Windows\SysWOW64\mshta.exe"
          3⤵
            PID:2764
          • C:\Windows\SysWOW64\mshta.exe
            "C:\Windows\SysWOW64\mshta.exe"
            3⤵
              PID:5096
            • C:\Windows\SysWOW64\mshta.exe
              "C:\Windows\SysWOW64\mshta.exe"
              3⤵
                PID:1432
              • C:\Windows\SysWOW64\mshta.exe
                "C:\Windows\SysWOW64\mshta.exe"
                3⤵
                  PID:212
                • C:\Windows\SysWOW64\mshta.exe
                  "C:\Windows\SysWOW64\mshta.exe"
                  3⤵
                    PID:1688
                  • C:\Windows\SysWOW64\mshta.exe
                    "C:\Windows\SysWOW64\mshta.exe"
                    3⤵
                      PID:3212
                    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
                      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
                      3⤵
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of WriteProcessMemory
                      PID:3196
                      • C:\Windows\SysWOW64\schtasks.exe
                        schtasks /create /f /sc ONLOGON /RL HIGHEST /tn LimeRAT-Admin /tr "'C:\Users\Admin\AppData\Local\Temp\Wservices.exe'"
                        4⤵
                        • Creates scheduled task(s)
                        PID:4956
                      • C:\Users\Admin\AppData\Local\Temp\Wservices.exe
                        "C:\Users\Admin\AppData\Local\Temp\Wservices.exe"
                        4⤵
                        • Executes dropped EXE
                        PID:3336

                Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                • C:\Users\Admin\AppData\Local\Temp\Wservices.exe

                  Filesize

                  44KB

                  MD5

                  9d352bc46709f0cb5ec974633a0c3c94

                  SHA1

                  1969771b2f022f9a86d77ac4d4d239becdf08d07

                  SHA256

                  2c1eeb7097023c784c2bd040a2005a5070ed6f3a4abf13929377a9e39fab1390

                  SHA512

                  13c714244ec56beeb202279e4109d59c2a43c3cf29f90a374a751c04fd472b45228ca5a0178f41109ed863dbd34e0879e4a21f5e38ae3d89559c57e6be990a9b

                • C:\Users\Admin\AppData\Local\Temp\Wservices.exe

                  Filesize

                  44KB

                  MD5

                  9d352bc46709f0cb5ec974633a0c3c94

                  SHA1

                  1969771b2f022f9a86d77ac4d4d239becdf08d07

                  SHA256

                  2c1eeb7097023c784c2bd040a2005a5070ed6f3a4abf13929377a9e39fab1390

                  SHA512

                  13c714244ec56beeb202279e4109d59c2a43c3cf29f90a374a751c04fd472b45228ca5a0178f41109ed863dbd34e0879e4a21f5e38ae3d89559c57e6be990a9b

                • C:\Users\Admin\AppData\Roaming\43486004\jvganwua.cvm

                  Filesize

                  223.7MB

                  MD5

                  fcdc76f4918415581833f1bcfbf8eb9a

                  SHA1

                  9b958e2999256a447684c34d2ca0aac61e703bf0

                  SHA256

                  a06190f5bf841a6f100f32fe41f45e97e54213556683ce7d2ff2b034cd0e3b5d

                  SHA512

                  4be535f2bb52bdca823ed40d2f44345e2e48dfd62793d70025b604c516f8de1edc2abf9111e501cf9c9dc60077d33717e1cae8e45163396d9ee2346176d84eef

                • C:\Users\Admin\AppData\Roaming\43486004\ssvklbb.ppt

                  Filesize

                  124KB

                  MD5

                  85be0fce2d73ebf5319916013d3cc913

                  SHA1

                  7a874685bf4619cfb0d6419587e6f27988710b61

                  SHA256

                  d2bff3004f8f7e2f4718f15d2f403af932177dd18100e77645233bdbca2ef4fa

                  SHA512

                  01b0268405bebd3d00b35302cec7092c97aa8ce9af1aa9ca291cf7281bc45ad234185a6f2f2ef3e87decf2d9e53fbfe33fe40daa271a8e7eea41eec5c005217f

                • C:\Users\Admin\AppData\Roaming\43486004\thaepnern.pif

                  Filesize

                  646KB

                  MD5

                  d3ffbde7ea1bcb2d0a6e6e12b0306625

                  SHA1

                  d8725bc8fdd1d5a5e7b9615dcd424bc9aa7322ff

                  SHA256

                  59e9d4edac6322ecfa53762dfaa541b2e6d7c3b0b9c6885fd7e0c3e18a38e14d

                  SHA512

                  70660fa375400b08610544b323dc7eb0f8258eda57822d1554f0811447a8e5fa0911e451a9a247a85a661cd5f7de8d6805e79617e62d5234bdf78e08b76b254a

                • C:\Users\Admin\AppData\Roaming\43486004\thaepnern.pif

                  Filesize

                  646KB

                  MD5

                  d3ffbde7ea1bcb2d0a6e6e12b0306625

                  SHA1

                  d8725bc8fdd1d5a5e7b9615dcd424bc9aa7322ff

                  SHA256

                  59e9d4edac6322ecfa53762dfaa541b2e6d7c3b0b9c6885fd7e0c3e18a38e14d

                  SHA512

                  70660fa375400b08610544b323dc7eb0f8258eda57822d1554f0811447a8e5fa0911e451a9a247a85a661cd5f7de8d6805e79617e62d5234bdf78e08b76b254a

                • memory/212-139-0x0000000000000000-mapping.dmp

                • memory/1432-138-0x0000000000000000-mapping.dmp

                • memory/1688-140-0x0000000000000000-mapping.dmp

                • memory/2764-136-0x0000000000000000-mapping.dmp

                • memory/3196-142-0x0000000001100000-0x00000000016A8000-memory.dmp

                  Filesize

                  5.7MB

                • memory/3196-147-0x0000000006A50000-0x0000000006FF4000-memory.dmp

                  Filesize

                  5.6MB

                • memory/3196-146-0x0000000005EF0000-0x0000000005F56000-memory.dmp

                  Filesize

                  408KB

                • memory/3196-143-0x0000000001108CCE-mapping.dmp

                • memory/3196-144-0x0000000001100000-0x000000000110C000-memory.dmp

                  Filesize

                  48KB

                • memory/3196-145-0x0000000005E50000-0x0000000005EEC000-memory.dmp

                  Filesize

                  624KB

                • memory/3212-141-0x0000000000000000-mapping.dmp

                • memory/3336-149-0x0000000000000000-mapping.dmp

                • memory/3336-153-0x00000000053D0000-0x000000000540C000-memory.dmp

                  Filesize

                  240KB

                • memory/3336-152-0x0000000000C10000-0x0000000000C1E000-memory.dmp

                  Filesize

                  56KB

                • memory/3476-135-0x0000000000000000-mapping.dmp

                • memory/4884-130-0x0000000000000000-mapping.dmp

                • memory/4956-148-0x0000000000000000-mapping.dmp

                • memory/5096-137-0x0000000000000000-mapping.dmp