ef5ai1p.dll

General
Target

ef5ai1p.dll

Filesize

539KB

Completed

19-11-2020 18:08

Score
10 /10
MD5

1ba0b20a2d03d8af03a7faa42b06417f

SHA1

4c528bb2afd93d8cb1199d05dc33d77e08f0ee88

SHA256

f5951b345050e10fa0d3b70b42e6b56d5a720a7a67c381345e33c145e2ba2452

Malware Config

Extracted

Family dridex
Botnet 10444
C2

162.241.44.26:9443

192.232.229.53:4443

77.220.64.34:443

193.90.12.121:3098

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/840-1-0x0000000000360000-0x000000000039D000-memory.dmpdridex_ldr
  • Blocklisted process makes network request
    rundll32.exe

    Reported IOCs

    flowpidprocess
    3840rundll32.exe
    7840rundll32.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 1980 wrote to memory of 8401980rundll32.exerundll32.exe
    PID 1980 wrote to memory of 8401980rundll32.exerundll32.exe
    PID 1980 wrote to memory of 8401980rundll32.exerundll32.exe
    PID 1980 wrote to memory of 8401980rundll32.exerundll32.exe
    PID 1980 wrote to memory of 8401980rundll32.exerundll32.exe
    PID 1980 wrote to memory of 8401980rundll32.exerundll32.exe
    PID 1980 wrote to memory of 8401980rundll32.exerundll32.exe
Processes 2
  • C:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\ef5ai1p.dll,#1
    Suspicious use of WriteProcessMemory
    PID:1980
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\ef5ai1p.dll,#1
      Blocklisted process makes network request
      Checks whether UAC is enabled
      PID:840
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/840-0-0x0000000000000000-mapping.dmp

                        • memory/840-1-0x0000000000360000-0x000000000039D000-memory.dmp

                        • memory/1008-2-0x000007FEF7810000-0x000007FEF7A8A000-memory.dmp