General

  • Target

    00001effb01cec7a867b5ccae0325fe1.exe

  • Size

    841KB

  • Sample

    210706-fwhkbdxys6

  • MD5

    00001effb01cec7a867b5ccae0325fe1

  • SHA1

    b739d4641afc15cb9b63a39bdc9c3a9b9cd05f01

  • SHA256

    6b95b02847bc1eae8b9b97da0cecb7f85f554314ecbea6affe44319ef1b5206b

  • SHA512

    6eb45861358cfb3e94a220dc632f8d2f12d357a4134c99dbdb5265ae3a768f93396b3d9973a93aca04deb9129e73ce176fe94a1d6dfe7d30374bd2730e6b6a2e

Malware Config

Extracted

Family

oski

C2

37.0.11.237/az/

Targets

    • Target

      00001effb01cec7a867b5ccae0325fe1.exe

    • Size

      841KB

    • MD5

      00001effb01cec7a867b5ccae0325fe1

    • SHA1

      b739d4641afc15cb9b63a39bdc9c3a9b9cd05f01

    • SHA256

      6b95b02847bc1eae8b9b97da0cecb7f85f554314ecbea6affe44319ef1b5206b

    • SHA512

      6eb45861358cfb3e94a220dc632f8d2f12d357a4134c99dbdb5265ae3a768f93396b3d9973a93aca04deb9129e73ce176fe94a1d6dfe7d30374bd2730e6b6a2e

    • Oski

      Oski is an infostealer targeting browser data, crypto wallets.

    • Looks for VirtualBox Guest Additions in registry

    • Downloads MZ/PE file

    • Looks for VMWare Tools registry key

    • Checks BIOS information in registry

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

    • Deletes itself

    • Loads dropped DLL

    • Reads user/profile data of web browsers

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

    • 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.

    • Maps connected drives based on registry

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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Defense Evasion

Virtualization/Sandbox Evasion

2
T1497

Credential Access

Credentials in Files

2
T1081

Discovery

Query Registry

6
T1012

Virtualization/Sandbox Evasion

2
T1497

System Information Discovery

4
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

2
T1005

Tasks