Analysis

  • max time kernel
    121s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    09/06/2024, 01:39

General

  • Target

    94f72fd4417343042fcacd56bd4491f0d638d37388c8d79839c3742c2ebbcaef.exe

  • Size

    2.4MB

  • MD5

    82f1a97f6d08a0d16ad9e44d05f724ba

  • SHA1

    4ac47621e58f6dfc22500de1c85feccca94cbefe

  • SHA256

    94f72fd4417343042fcacd56bd4491f0d638d37388c8d79839c3742c2ebbcaef

  • SHA512

    76ec2d51301f3f15a74ce572d10f4e99727d40b6a841195e798987fa17b3ae5604d9fd6fc824f2eef209cc60827ed400deb35c85ca0e408d0c8a4350f31dbdd2

  • SSDEEP

    49152:uxFPv/gxRpiyLV1i/DeGjYiw7OWsAKSyue66vrHJk:uV38p9+DeGcFOLzub6vry

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

  • Detect Vidar Stealer 1 IoCs
  • Stealc

    Stealc is an infostealer written in C++.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Detects Windows executables referencing non-Windows User-Agents 1 IoCs
  • Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion 1 IoCs
  • Detects executables containing potential Windows Defender anti-emulation checks 1 IoCs
  • Downloads MZ/PE file
  • Deletes itself 1 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of web browsers 2 TTPs

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

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

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

  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 1 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Modifies system certificate store 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\94f72fd4417343042fcacd56bd4491f0d638d37388c8d79839c3742c2ebbcaef.exe
    "C:\Users\Admin\AppData\Local\Temp\94f72fd4417343042fcacd56bd4491f0d638d37388c8d79839c3742c2ebbcaef.exe"
    1⤵
    • Checks processor information in registry
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2676
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\94f72fd4417343042fcacd56bd4491f0d638d37388c8d79839c3742c2ebbcaef.exe" & rd /s /q "C:\ProgramData\IEGCAAKFBAEG" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:384
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 10
        3⤵
        • Delays execution with timeout.exe
        PID:576

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

    Filesize

    70KB

    MD5

    49aebf8cbd62d92ac215b2923fb1b9f5

    SHA1

    1723be06719828dda65ad804298d0431f6aff976

    SHA256

    b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

    SHA512

    bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

    Filesize

    342B

    MD5

    19a2c6b8d0a9811968a5248426171560

    SHA1

    9ff767ca7e5dc31ca52c888b377f4a3fccc3f9e3

    SHA256

    5682b64f3465eaab5f7d07159cf90bc429f77a8958d2c7aba5b559e72e7b7551

    SHA512

    a2324ab5bad0b1527c50f50cfbcbcbd29e0ae422da78e8513106cd7b57e02f664b5b08febd8e1f8062dd4fc9fc099045075336d15ed224617fb9f281bd019ffe

  • C:\Users\Admin\AppData\Local\Temp\Tar37CA.tmp

    Filesize

    181KB

    MD5

    4ea6026cf93ec6338144661bf1202cd1

    SHA1

    a1dec9044f750ad887935a01430bf49322fbdcb7

    SHA256

    8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

    SHA512

    6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

  • memory/2676-0-0x0000000001310000-0x00000000019D7000-memory.dmp

    Filesize

    6.8MB

  • memory/2676-192-0x0000000029C90000-0x0000000029EEF000-memory.dmp

    Filesize

    2.4MB