Overview

overview

10

Static

static

3

DingTalkD_...26.exe

windows10-2004-x64

10

DingTalkD_...26.exe

windows11-ltsc_2024-x64

10

Sharing

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General

  • Target
    DingTalkD_Setup2026.exe
  • Size 42.3MB
  • Sample260719-26ecnafs3p
  • SHA256 e6f4c46f2a72a4d8b1eda2c2c431c64d73eae7057221b35a6fc16138e4dc4d43
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
valleyrat_s2backdoordiscoveryinstallerpersistenceupx

Malware Config

Extracted

Family

  • valleyrat_s2

Version

  • 1.0

C2

  • 192.197.113.54:332

  • 127.0.0.1:80

Attributes
  • campaign_date

    2026. 7.16

Targets

    • Target
      DingTalkD_Setup2026.exe
    • Size 42.3MB
    • SHA256 e6f4c46f2a72a4d8b1eda2c2c431c64d73eae7057221b35a6fc16138e4dc4d43
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    backdoordiscoveryvalleyrat_s2installerpersistenceupx

    • Detects ValleyRAT payload

    • Family: ValleyRat

      ValleyRat stage2 is a backdoor written in C++.

      backdoorvalleyrat_s2

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Adds Run key to start application

      persistence

    • Checks installed software on the system

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

      discovery

    • Enumerates connected drives

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

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

      upx
    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Tasks