Resubmissions

01-12-2021 09:50

211201-lvc3fsbccn 10

27-10-2021 09:08

211027-k38zesbch3 10

Analysis

  • max time kernel
    1800s
  • max time network
    1804s
  • platform
    windows7_x64
  • resource
    win7-en-20210920
  • submitted
    27-10-2021 09:08

General

  • Target

    872bf2c276fe3242513c2ed1b254a5ab3c0dea273dde944c05b711697811753f.sample.exe

Malware Config

Extracted

Path

C:\NABFAM-DECRYPT.txt

Ransom Note
---= GANDCRAB V5.0.1 =--- Attention! All your files, documents, photos, databases and other important files are encrypted and have the extension: .NABFAM The only method of recovering files is to purchase an unique private key. Only we can give you this key and only we can recover your files. The server with your key is in a closed network TOR. You can get there by the following ways: ---------------------------------------------------------------------------------------- | 0. Download Tor browser - https://www.torproject.org/ | 1. Install Tor browser | 2. Open Tor Browser | 3. Open link in TOR browser: http://gandcrabmfe6mnef.onion/b202954f5a21e15a | 4. Follow the instructions on this page ---------------------------------------------------------------------------------------- On our page you will see instructions on payment and get the opportunity to decrypt 1 file for free. ATTENTION! IN ORDER TO PREVENT DATA DAMAGE: * DO NOT MODIFY ENCRYPTED FILES * DO NOT CHANGE DATA BELOW ---BEGIN GANDCRAB KEY--- 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 ---END GANDCRAB KEY--- ---BEGIN PC DATA--- wfKD6iudumBkmpL8IRr4U4exEVaoOXLtwDwmOrT1y1YWvOiWMx5GYaRdvZZdTo1RvXYU7nBWvbfcTG+Hhh5qBJzzs9MC7736UkGSDDniUJJG8/LFF//kmGmoAZAGLo2j5/wd2UrxMJK+iqKhTkS3ArgAxrZOOOiXrbnhbWMkLHQnbYuWlMClYZxYU6SDxpopRo5r292AV1KIZBZV4APBuUHcKSIr2MWMI0O1MKIP2IpKLE2TS5wLmpQodXZhP6M/UPrO1sZzkDbgjYlAG3g8l65nVd0/CBUxKQ7KDJYrtX0vSmnFXg/ykfgtJNiwqfCnqbr85+BisbFwkUjB4uKt/2M2FetwGt5YPVqBBibt+BHXEdwb8CcE4oG4b6a1Y8ZyGoyp2Q2iuJRzTRoqGlPQJIAJpJFswNcoAhPJnK0+Ce5dALefhGEwg7NrKg3sxA1KwA7/ZinpCRFO3vDLOOav1w4ZJ3RPRgGKcTnY1ljgYn9OmQ3fyiydQRBnybIjlsmw6HIKVZjpOjehfFYcP8A6PylN3H9bQ3TCxaZCEv3tLUi+BdhMPpGxHsMOI7+QRdQP94kvV//uurM= ---END PC DATA---
URLs

http://gandcrabmfe6mnef.onion/b202954f5a21e15a

Signatures

  • Gandcrab

    Gandcrab is a Trojan horse that encrypts files on a computer.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files 3 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Enumerates connected drives 3 TTPs 24 IoCs

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

  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Drops file in Program Files directory 22 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 3 IoCs

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

  • Modifies system certificate store 2 TTPs 19 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 43 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\872bf2c276fe3242513c2ed1b254a5ab3c0dea273dde944c05b711697811753f.sample.exe
    "C:\Users\Admin\AppData\Local\Temp\872bf2c276fe3242513c2ed1b254a5ab3c0dea273dde944c05b711697811753f.sample.exe"
    1⤵
    • Modifies extensions of user files
    • Enumerates connected drives
    • Sets desktop wallpaper using registry
    • Drops file in Program Files directory
    • Checks processor information in registry
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:368
    • C:\Windows\SysWOW64\wbem\wmic.exe
      "C:\Windows\system32\wbem\wmic.exe" shadowcopy delete
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1156
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1688

Network

MITRE ATT&CK Matrix ATT&CK v6

Defense Evasion

File Deletion

1
T1107

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

2
T1012

Peripheral Device Discovery

1
T1120

System Information Discovery

3
T1082

Collection

Data from Local System

1
T1005

Impact

Inhibit System Recovery

1
T1490

Defacement

1
T1491

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/368-54-0x0000000074B41000-0x0000000074B43000-memory.dmp
    Filesize

    8KB

  • memory/1156-55-0x0000000000000000-mapping.dmp