ucjk7st

General
Target

ucjk7st.dll

Filesize

426KB

Completed

26-11-2020 12:07

Score
10 /10
MD5

455e8c40a659762249a13b5ef6cfb2cb

SHA1

818423b1fc4f4149e2bda0feb359c1605de1eb6c

SHA256

8ceb186696c9bda47466e5ecd1d0f0d5f93318e8bdc6b42454dd3be884e99e33

Malware Config

Extracted

Family dridex
Botnet 10555
C2

194.225.58.216:443

178.254.40.132:691

216.172.165.70:3889

198.57.200.100:3786

rc4.plain
rc4.plain
Signatures 6

Filter: none

Discovery
  • Dridex

    Description

    Dridex(known as Bugat/Cridex) is a form of malware that specializes in stealing bank credentials.

  • Dridex Loader

    Description

    Detects Dridex both x86 and x64 loader in memory.

    Reported IOCs

    resourceyara_rule
    behavioral1/memory/368-1-0x00000000002C0000-0x00000000002FD000-memory.dmpdridex_ldr
  • Blocklisted process makes network request
    rundll32.exe

    Reported IOCs

    flowpidprocess
    2368rundll32.exe
    6368rundll32.exe
    7368rundll32.exe
    9368rundll32.exe
  • Checks installed software on the system

    Description

    Looks up Uninstall key entries in the registry to enumerate software on the system.

    Tags

    TTPs

    Query Registry
  • Checks whether UAC is enabled
    rundll32.exe

    TTPs

    System Information Discovery

    Reported IOCs

    descriptioniocprocess
    Key value queried\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUArundll32.exe
  • Suspicious use of WriteProcessMemory
    rundll32.exe

    Reported IOCs

    descriptionpidprocesstarget process
    PID 848 wrote to memory of 368848rundll32.exerundll32.exe
    PID 848 wrote to memory of 368848rundll32.exerundll32.exe
    PID 848 wrote to memory of 368848rundll32.exerundll32.exe
    PID 848 wrote to memory of 368848rundll32.exerundll32.exe
    PID 848 wrote to memory of 368848rundll32.exerundll32.exe
    PID 848 wrote to memory of 368848rundll32.exerundll32.exe
    PID 848 wrote to memory of 368848rundll32.exerundll32.exe
Processes 2
  • C:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\ucjk7st.dll,#1
    Suspicious use of WriteProcessMemory
    PID:848
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\ucjk7st.dll,#1
      Blocklisted process makes network request
      Checks whether UAC is enabled
      PID:368
Network
MITRE ATT&CK Matrix
Collection
    Command and Control
      Credential Access
        Defense Evasion
          Execution
            Exfiltration
              Impact
                Initial Access
                  Lateral Movement
                    Persistence
                      Privilege Escalation
                        Replay Monitor
                        00:00 00:00
                        Downloads
                        • memory/368-0-0x0000000000000000-mapping.dmp

                        • memory/368-1-0x00000000002C0000-0x00000000002FD000-memory.dmp

                        • memory/1232-2-0x000007FEF6580000-0x000007FEF67FA000-memory.dmp