Analysis

  • max time kernel
    119s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    19-12-2021 08:49

General

  • Target

    5b5540baed04e453ae72ca2fc74b2a6b.exe

  • Size

    373KB

  • MD5

    5b5540baed04e453ae72ca2fc74b2a6b

  • SHA1

    d93e8a383780308c73ebb639024b2029f64d72a1

  • SHA256

    d7e055feae0f43ff14859faafa33113ceba3977171497635576fd74608a64a7f

  • SHA512

    bafcc00a56e69d1c81d966c0ea0d276ae0a63bcd8b06584c5eee5caf3d4321a0926b1cb2e593b47ef2d55e6728ecf3377fb37cc2130cdd1b182d709e08ec67f1

Malware Config

Extracted

Family

cryptbot

C2

sezfva72.top

morbaf07.top

Attributes
  • payload_url

    http://ekuniv18.top/download.php?file=impish.exe

Signatures

  • CryptBot

    A C++ stealer distributed widely in bundle with other software.

  • Deletes itself 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\5b5540baed04e453ae72ca2fc74b2a6b.exe
    "C:\Users\Admin\AppData\Local\Temp\5b5540baed04e453ae72ca2fc74b2a6b.exe"
    1⤵
    • Checks processor information in registry
    • Suspicious use of WriteProcessMemory
    PID:612
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c rd /s /q C:\Users\Admin\AppData\Local\Temp\oMJxMDciMNOk & timeout 4 & del /f /q "C:\Users\Admin\AppData\Local\Temp\5b5540baed04e453ae72ca2fc74b2a6b.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:656
      • C:\Windows\SysWOW64\timeout.exe
        timeout 4
        3⤵
        • Delays execution with timeout.exe
        PID:1228

Network

MITRE ATT&CK Matrix ATT&CK v6

Discovery

System Information Discovery

2
T1082

Query Registry

1
T1012

Replay Monitor

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Downloads

  • memory/612-54-0x000000000026B000-0x0000000000291000-memory.dmp
    Filesize

    152KB

  • memory/612-55-0x0000000075891000-0x0000000075893000-memory.dmp
    Filesize

    8KB

  • memory/612-56-0x0000000001C10000-0x0000000001C55000-memory.dmp
    Filesize

    276KB

  • memory/612-57-0x0000000000400000-0x00000000004DE000-memory.dmp
    Filesize

    888KB

  • memory/656-58-0x0000000000000000-mapping.dmp
  • memory/1228-59-0x0000000000000000-mapping.dmp