General

  • Target

    1.exe

  • Size

    2.5MB

  • Sample

    241115-27ed2stlhv

  • MD5

    a13b59f33063b970d7adbe2a23fb5a81

  • SHA1

    7a8f1204af663a38f87816c528e27137f310ae42

  • SHA256

    9700e6f8ed338b7ebf337feef5a215a65d061a709a9067218d5ae73093ecb946

  • SHA512

    6affe7c79c186e4d466c2f975987af39452d9991453d394efdf93af67c5d8e367ab867625d17ecdb2778c5962c40eea9a207e15c48f9346c58d875b86ce7459f

  • SSDEEP

    49152:qbA3q2mzyt2DixLb4I5KKnK5zgdlKWkyT:qbrtzyoWFbvKKnK5Anks

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot7606992605:AAHdyli6CX1hNl7JUoS2-auLJ7WvyqQjHD8/sendPhoto?chat_id=7606992605&caption=%E2%9D%95%20User%20connected%20%E2%9D%95%0A%E2%80%A2%20ID%3A%20c325be7df51e043c04c118ef2bb738d43e08ff03%0A%E2%80%A2%20Comment%3A%20%D1%8E%D1%82%D1%83%D0%B1%0A%0A%E2%80%A2%20User%20Name%3A%20Admin%0A%E2%80%A2%20PC%20Name%3A%20ZTSLLRFH%0A%E2%80%A2%20OS%20Info%3A%20Windows%2010%20Pro%0A%0A%E2%80%A2%20IP%3A%20181.215.176.83%0A%E2%80%A2%20GEO%3A%20GB%20%2F%20London%0A%0A%E2%80%A2%20Working%20Directory%3A%20C%3A%5Cbrowserperf%5Csysmon.ex

https://api.telegram.org/bot7606992605:AAHdyli6CX1hNl7JUoS2-auLJ7WvyqQjHD8/sendDocument?chat_id=7606992605&caption=%F0%9F%93%8E%20Log%20collected%20%F0%9F%93%8E%0A%E2%80%A2%20ID%3A%20c325be7df51e043c04c118ef2bb738d43e08ff03%0A%0A%E2%80%A2%20Scanned%20Directories%3A%200%0A%E2%80%A2%20Elapsed%20Time%3A%2000%3A00%3A38.392558

https://api.telegram.org/bot7606992605:AAHdyli6CX1hNl7JUoS2-auLJ7WvyqQjHD8/sendDocument?chat_id=7606992605&caption=%F0%9F%93%8E%20Log%20collected%20%F0%9F%93%8E%0A%E2%80%A2%20ID%3A%20c325be7df51e043c04c118ef2bb738d43e08ff03%0A%0A%E2%80%A2%20Scanned%20Directories%3A%200%0A%E2%80%A2%20Elapsed%20Time%3A%2000%3A00%3A11.283864

Targets

    • Target

      1.exe

    • Size

      2.5MB

    • MD5

      a13b59f33063b970d7adbe2a23fb5a81

    • SHA1

      7a8f1204af663a38f87816c528e27137f310ae42

    • SHA256

      9700e6f8ed338b7ebf337feef5a215a65d061a709a9067218d5ae73093ecb946

    • SHA512

      6affe7c79c186e4d466c2f975987af39452d9991453d394efdf93af67c5d8e367ab867625d17ecdb2778c5962c40eea9a207e15c48f9346c58d875b86ce7459f

    • SSDEEP

      49152:qbA3q2mzyt2DixLb4I5KKnK5zgdlKWkyT:qbrtzyoWFbvKKnK5Anks

    • DcRat

      DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

    • Dcrat family

    • Gurcu family

    • Gurcu, WhiteSnake

      Gurcu is a malware stealer written in C#.

    • Modifies WinLogon for persistence

    • Process spawned unexpected child process

      This typically indicates the parent process was compromised via an exploit or macro.

    • UAC bypass

    • DCRat payload

      Detects payload of DCRat, commonly dropped by NSIS installers.

    • Disables Task Manager via registry modification

    • Drops file in Drivers directory

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • 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

    • Checks whether UAC is enabled

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

MITRE ATT&CK Enterprise v15

Tasks