Analysis

  • max time kernel
    153s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/01/2023, 11:38

General

  • Target
    file.exe
  • Size 260KB
  • Sample230114-nrp9qaef97
  • SHA256 4c7f1d41296aa50b31051bddff7d4fc4f911b04cbc0bc8509a5f41af38952d3e
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Detects Smokeloader packer 1 IoCs
  • SmokeLoader

    Modular backdoor trojan in use since 2014.

  • Blocklisted process makes network request 3 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 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.

  • Program crash 1 IoCs
  • Checks SCSI registry key(s) 3 TTPs 6 IoCs

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

  • Checks processor information in registry 2 TTPs 24 IoCs

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

  • Modifies Internet Explorer settings 1 TTPs 4 IoCs
  • Modifies registry class 30 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 18 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:2596
  • C:\Users\Admin\AppData\Local\Temp\D372.exe
    C:\Users\Admin\AppData\Local\Temp\D372.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:2316
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Rruwtqrefy.tmp",Uuhpdwiyer
      2⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:3584
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 17203
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:2212
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2316 -s 532
      2⤵
      • Program crash
      PID:3696
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2316 -ip 2316
    1⤵
      PID:3448
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:1784
      • C:\Users\Admin\AppData\Roaming\sejicff
        C:\Users\Admin\AppData\Roaming\sejicff
        1⤵
        • Executes dropped EXE
        • Checks SCSI registry key(s)
        • Suspicious behavior: MapViewOfSection
        PID:5112

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            D372.exe

            • Path C:\Users\Admin\AppData\Local\Temp\D372.exe
            • Size 1.1MB
            • SHA256 4fb219c826c09b48e9c0a4ccf073eaefb414919aa65f30adfb6fd38231228c4d
            • MD5 SHA1 SHA512 SSDEEP

            D372.exe

            • Path C:\Users\Admin\AppData\Local\Temp\D372.exe
            • Size 1.1MB
            • SHA256 4fb219c826c09b48e9c0a4ccf073eaefb414919aa65f30adfb6fd38231228c4d
            • MD5 SHA1 SHA512 SSDEEP

            Rruwtqrefy.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\Rruwtqrefy.tmp
            • Size 805KB
            • SHA256 c5cd7d52ba95127c18556a2ddca64e4ef80a2945e6579545c0067abdab3a0ad0
            • MD5 SHA1 SHA512 SSDEEP

            Rruwtqrefy.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\Rruwtqrefy.tmp
            • Size 805KB
            • SHA256 c5cd7d52ba95127c18556a2ddca64e4ef80a2945e6579545c0067abdab3a0ad0
            • MD5 SHA1 SHA512 SSDEEP

            sejicff

            • Path C:\Users\Admin\AppData\Roaming\sejicff
            • Size 260KB
            • SHA256 4c7f1d41296aa50b31051bddff7d4fc4f911b04cbc0bc8509a5f41af38952d3e
            • MD5 SHA1 SHA512 SSDEEP

            sejicff

            • Path C:\Users\Admin\AppData\Roaming\sejicff
            • Size 260KB
            • SHA256 4c7f1d41296aa50b31051bddff7d4fc4f911b04cbc0bc8509a5f41af38952d3e
            • MD5 SHA1 SHA512 SSDEEP

            memory/2212-159-0x000001B936320000-0x000001B9365C9000-memory.dmp

            memory/2212-158-0x0000000000020000-0x00000000002B8000-memory.dmp

            memory/2212-156-0x000001B937D70000-0x000001B937EB0000-memory.dmp

            memory/2212-155-0x000001B937D70000-0x000001B937EB0000-memory.dmp

            memory/2316-140-0x0000000004AE0000-0x0000000004C04000-memory.dmp

            memory/2316-141-0x0000000000400000-0x0000000002C7D000-memory.dmp

            memory/2316-145-0x0000000000400000-0x0000000002C7D000-memory.dmp

            memory/2316-139-0x00000000049EE000-0x0000000004AD2000-memory.dmp

            memory/2596-135-0x0000000000400000-0x0000000002BA9000-memory.dmp

            memory/2596-132-0x0000000002D7D000-0x0000000002D8E000-memory.dmp

            memory/2596-133-0x0000000002D40000-0x0000000002D49000-memory.dmp

            memory/2596-134-0x0000000000400000-0x0000000002BA9000-memory.dmp

            memory/3584-153-0x0000000005950000-0x0000000005A90000-memory.dmp

            memory/3584-148-0x0000000005950000-0x0000000005A90000-memory.dmp

            memory/3584-152-0x0000000005950000-0x0000000005A90000-memory.dmp

            memory/3584-147-0x0000000004D60000-0x000000000588F000-memory.dmp

            memory/3584-157-0x00000000059C9000-0x00000000059CB000-memory.dmp

            memory/3584-146-0x0000000004D60000-0x000000000588F000-memory.dmp

            memory/3584-149-0x0000000005950000-0x0000000005A90000-memory.dmp

            memory/3584-160-0x0000000004D60000-0x000000000588F000-memory.dmp

            memory/3584-151-0x0000000005950000-0x0000000005A90000-memory.dmp

            memory/3584-150-0x0000000005950000-0x0000000005A90000-memory.dmp

            memory/5112-163-0x0000000002E9D000-0x0000000002EAE000-memory.dmp

            memory/5112-164-0x0000000000400000-0x0000000002BA9000-memory.dmp

            memory/5112-165-0x0000000000400000-0x0000000002BA9000-memory.dmp