General

  • Target

    .

  • Size

    13KB

  • Sample

    230411-r3x1gsda75

  • MD5

    d8b7f7230827c80019768db823f7f3b7

  • SHA1

    eed8e0ed77610ff2c4513e93cc66ed5e6016ce5b

  • SHA256

    fdaf5db4f6ea7dce12bbd41267a11432980cb29522e3311c34d34894437a9a15

  • SHA512

    9465b1ce0973bddc0bc92972ed310960e41b5407d9bf6fa58b6cbfd18b75511d967d017b1c1d0d92b0f2e7a364275a3e7408b7a5f84ab5b8918897733fe9cba7

  • SSDEEP

    384:rJCQRcIGLiVoOsKUElKeGMiU8HhhbPok28rtGZ:rcwBVoOsKvI1MoBhbQqru

Malware Config

Targets

    • Target

      .

    • Size

      13KB

    • MD5

      d8b7f7230827c80019768db823f7f3b7

    • SHA1

      eed8e0ed77610ff2c4513e93cc66ed5e6016ce5b

    • SHA256

      fdaf5db4f6ea7dce12bbd41267a11432980cb29522e3311c34d34894437a9a15

    • SHA512

      9465b1ce0973bddc0bc92972ed310960e41b5407d9bf6fa58b6cbfd18b75511d967d017b1c1d0d92b0f2e7a364275a3e7408b7a5f84ab5b8918897733fe9cba7

    • SSDEEP

      384:rJCQRcIGLiVoOsKUElKeGMiU8HhhbPok28rtGZ:rcwBVoOsKvI1MoBhbQqru

    • Modifies WinLogon for persistence

    • UAC bypass

    • Disables RegEdit via registry modification

    • Disables Task Manager via registry modification

    • Downloads MZ/PE file

    • Modifies extensions of user files

      Ransomware generally changes the extension on encrypted files.

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies system executable filetype association

    • Obfuscated with Agile.Net obfuscator

      Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

    • Reads user/profile data of web browsers

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

    • Adds Run key to start application

    • Drops desktop.ini file(s)

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Winlogon Helper DLL

1
T1004

Change Default File Association

1
T1042

Registry Run Keys / Startup Folder

1
T1060

Bootkit

1
T1067

Hidden Files and Directories

1
T1158

Privilege Escalation

Bypass User Account Control

1
T1088

Defense Evasion

Modify Registry

6
T1112

Bypass User Account Control

1
T1088

Disabling Security Tools

1
T1089

Hidden Files and Directories

1
T1158

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

4
T1012

System Information Discovery

4
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

1
T1005

Command and Control

Web Service

1
T1102

Tasks