Overview

overview

10

Static

static

1

RFQ-MA-INV...-B.exe

windows7_x64

10

RFQ-MA-INV...-B.exe

windows10_x64

10

Analysis

  • max time kernel
    121s
  • max time network
    153s
  • platform
    windows10_x64
  • resource
    win10-en-20211208
  • submitted
    13/01/2022, 10:56

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General

  • Target
    RFQ-MA-INV0009-2201-B.exe
  • Size 565KB
  • Sample220113-m1ph4shee3
  • SHA256 9b4952dc2d34aba59e87c0c185358a57acb0fd071d63fc2af6c6c9ae8952be37
  • MD5 SHA1 SHA512
Score
10/10
oskidiscoveryinfostealerspywarestealer

Malware Config

Extracted

Family

  • oski

C2

  • archosk.xyz

Signatures

  • Oski

    Oski is an infostealer targeting browser data, crypto wallets.

    infostealeroski
  • Downloads MZ/PE file
  • Loads dropped DLL 4 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

    spywarestealer
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
    spyware
  • Checks installed software on the system 1 TTPs

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

    discovery
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Checks processor information in registry 2 TTPs 1 IoCs

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

  • Kills process with taskkill 1 IoCs
    evasion
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RFQ-MA-INV0009-2201-B.exe
    "C:\Users\Admin\AppData\Local\Temp\RFQ-MA-INV0009-2201-B.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:3712
    • C:\Users\Admin\AppData\Local\Temp\RFQ-MA-INV0009-2201-B.exe
      "C:\Users\Admin\AppData\Local\Temp\RFQ-MA-INV0009-2201-B.exe"
      2⤵
      • Loads dropped DLL
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:2680
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c taskkill /pid 2680 & erase C:\Users\Admin\AppData\Local\Temp\RFQ-MA-INV0009-2201-B.exe & RD /S /Q C:\\ProgramData\\826289359821203\\* & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1028
        • C:\Windows\SysWOW64\taskkill.exe
          taskkill /pid 2680
          4⤵
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:3148

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/2680-117-0x0000000000490000-0x00000000004C8000-memory.dmp
        Download

        memory/2680-120-0x0000000000490000-0x00000000004C8000-memory.dmp
        Download