General

  • Target

    SKM20212210RFQ00100490100.exe

  • Size

    714KB

  • Sample

    211023-ham55sdbbl

  • MD5

    937c3eeb4afc46f15972f8631f098fec

  • SHA1

    b4f162eaca7ea8cca9f0e637ea81a4eb349fef1e

  • SHA256

    b1b14fd02510b79ea7f4a9a767d3738fc9761ce0b5d8b0ca969912d7942e8a94

  • SHA512

    07c0802c6a6e96b3a001ef5144f80260c1d17e8197fca77baadb52c1f3ec62e88d95ab72ba15a2edc70482c0df5c7f8985130ba64c3d98ec778f475da7bf3f63

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

cigdem5.duckdns.org:6606

cigdem5.duckdns.org:7707

cigdem5.duckdns.org:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes
  • anti_vm

    false

  • bsod

    false

  • delay

    3

  • install

    false

  • install_folder

    %AppData%

  • pastebin_config

    null

aes.plain

Targets

    • Target

      SKM20212210RFQ00100490100.exe

    • Size

      714KB

    • MD5

      937c3eeb4afc46f15972f8631f098fec

    • SHA1

      b4f162eaca7ea8cca9f0e637ea81a4eb349fef1e

    • SHA256

      b1b14fd02510b79ea7f4a9a767d3738fc9761ce0b5d8b0ca969912d7942e8a94

    • SHA512

      07c0802c6a6e96b3a001ef5144f80260c1d17e8197fca77baadb52c1f3ec62e88d95ab72ba15a2edc70482c0df5c7f8985130ba64c3d98ec778f475da7bf3f63

    • AsyncRat

      AsyncRAT is designed to remotely monitor and control other computers.

    • Modifies Windows Defender Real-time Protection settings

    • UAC bypass

    • Windows security bypass

    • suricata: ET MALWARE Observed Malicious SSL Cert (AsyncRAT Server)

      suricata: ET MALWARE Observed Malicious SSL Cert (AsyncRAT Server)

    • Async RAT payload

    • Nirsoft

    • Executes dropped EXE

    • Drops startup file

    • Loads dropped DLL

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads user/profile data of local email clients

      Email clients store some user data on disk where infostealers will often target it.

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Windows security modification

    • Accesses Microsoft Outlook profiles

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Privilege Escalation

Bypass User Account Control

1
T1088

Defense Evasion

Modify Registry

6
T1112

Disabling Security Tools

4
T1089

Bypass User Account Control

1
T1088

Credential Access

Credentials in Files

3
T1081

Discovery

System Information Discovery

2
T1082

Collection

Data from Local System

3
T1005

Email Collection

1
T1114

Tasks