General

  • Target

    8325e7768964ebee192622a378e7f28f.exe

  • Size

    747KB

  • Sample

    210706-paar28k8pe

  • MD5

    8325e7768964ebee192622a378e7f28f

  • SHA1

    47ad27a29e5d3c8449fe41287bc3957bb8c37aff

  • SHA256

    bef42b4bb33bf2edb112d4e084df6e7aaad37b429b00ac783b9fe14eb08ac3f6

  • SHA512

    ba2fd924cd43d9fd4dce8956e22dbe8e33c11fe35e8acf5262dd18e102a6dcf49e931dd532f96a759e87ebccc00d55255aac67c438fb689a2ea41f6cdcf0e465

Malware Config

Extracted

Family

oski

C2

http://37.0.11.237/nn/

Targets

    • Target

      8325e7768964ebee192622a378e7f28f.exe

    • Size

      747KB

    • MD5

      8325e7768964ebee192622a378e7f28f

    • SHA1

      47ad27a29e5d3c8449fe41287bc3957bb8c37aff

    • SHA256

      bef42b4bb33bf2edb112d4e084df6e7aaad37b429b00ac783b9fe14eb08ac3f6

    • SHA512

      ba2fd924cd43d9fd4dce8956e22dbe8e33c11fe35e8acf5262dd18e102a6dcf49e931dd532f96a759e87ebccc00d55255aac67c438fb689a2ea41f6cdcf0e465

    • 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