General

  • Target

    51bf88b291e3b35a12f4c253bf8377c3.exe

  • Size

    791KB

  • Sample

    230314-x6n5msbc8z

  • MD5

    51bf88b291e3b35a12f4c253bf8377c3

  • SHA1

    787c0e9a2b3ca8237a0fffc4f47bba07722d082d

  • SHA256

    1618813f2071072453fa1a3d36983cc983d69a5edc3c4406c274ebf9b3d0d594

  • SHA512

    4b7a1494e8fac022933fa274a737191dc51f094802a247f02e032e65774b3f87c5d23e5a9481553837aa2abe26b4586e747abd36e13aaa8d21d003e779f5ec0b

  • SSDEEP

    12288:Nu5WWa4ojAtbuTZCZPAl6Qo007IDt3D/Ykps5pb5SxVfrbyax1ejueDoUFbH:A4W+EMTsxAlg03Db65V5SnbyXikHFbH

Malware Config

Extracted

Family

cryptbot

C2

http://ernlen22.top/gate.php

Targets

    • Target

      51bf88b291e3b35a12f4c253bf8377c3.exe

    • Size

      791KB

    • MD5

      51bf88b291e3b35a12f4c253bf8377c3

    • SHA1

      787c0e9a2b3ca8237a0fffc4f47bba07722d082d

    • SHA256

      1618813f2071072453fa1a3d36983cc983d69a5edc3c4406c274ebf9b3d0d594

    • SHA512

      4b7a1494e8fac022933fa274a737191dc51f094802a247f02e032e65774b3f87c5d23e5a9481553837aa2abe26b4586e747abd36e13aaa8d21d003e779f5ec0b

    • SSDEEP

      12288:Nu5WWa4ojAtbuTZCZPAl6Qo007IDt3D/Ykps5pb5SxVfrbyax1ejueDoUFbH:A4W+EMTsxAlg03Db65V5SnbyXikHFbH

    • CryptBot

      A C++ stealer distributed widely in bundle with other software.

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Checks BIOS information in registry

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

    • Checks computer location settings

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

    • Deletes itself

    • 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.

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Checks installed software on the system

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

    • Checks whether UAC is enabled

    • Maps connected drives based on registry

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

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Defense Evasion

Virtualization/Sandbox Evasion

1
T1497

Credential Access

Credentials in Files

2
T1081

Discovery

Query Registry

6
T1012

Virtualization/Sandbox Evasion

1
T1497

System Information Discovery

6
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

2
T1005

Tasks