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Analysis

  • max time kernel
    122s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-20240215-en
  • resource tags

    arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system
  • submitted
    22/05/2024, 10:00

General

  • Target

    efa9c92c5e7d0608cee15af285a48d5a6a8b7bff95c26287f611f3a5bba9e0c1.exe

  • Size

    2.0MB

  • MD5

    19744978fe9f7728f71e0fc7b445a0f6

  • SHA1

    53eb2f859a57a4d82c26a1572c78088428fd60ba

  • SHA256

    efa9c92c5e7d0608cee15af285a48d5a6a8b7bff95c26287f611f3a5bba9e0c1

  • SHA512

    315f983d4529a5e8e042a5f9ea62be6605e411a0e1e006c639c11998a9aea74df8523a9ad4754ba67628b6e8c5c03f9ccc97730c8cfa5613961e702cbe8c2153

  • SSDEEP

    49152:IFno/jfsJtTF+TxMoxc1TU+j+dAzGkiT:IFno/jEtIuoITsdZT

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

  • Detect Vidar Stealer 10 IoCs
  • Stealc

    Stealc is an infostealer written in C++.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Detect binaries embedding considerable number of MFA browser extension IDs. 4 IoCs
  • Detect binaries embedding considerable number of cryptocurrency wallet browser extension IDs. 4 IoCs
  • Detects Windows executables referencing non-Windows User-Agents 9 IoCs
  • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 4 IoCs
  • Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion 9 IoCs
  • Detects executables containing potential Windows Defender anti-emulation checks 9 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Checks installed software on the system 1 TTPs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Checks processor information in registry 2 TTPs 1 IoCs

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

  • Modifies system certificate store 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\efa9c92c5e7d0608cee15af285a48d5a6a8b7bff95c26287f611f3a5bba9e0c1.exe
    "C:\Users\Admin\AppData\Local\Temp\efa9c92c5e7d0608cee15af285a48d5a6a8b7bff95c26287f611f3a5bba9e0c1.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1844
    • C:\Users\Admin\AppData\Local\Temp\katE34.tmp
      C:\Users\Admin\AppData\Local\Temp\katE34.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      PID:1652

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    68KB

    MD5

    29f65ba8e88c063813cc50a4ea544e93

    SHA1

    05a7040d5c127e68c25d81cc51271ffb8bef3568

    SHA256

    1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

    SHA512

    e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

  • C:\Users\Admin\AppData\Local\Temp\Tar1211.tmp

    Filesize

    177KB

    MD5

    435a9ac180383f9fa094131b173a2f7b

    SHA1

    76944ea657a9db94f9a4bef38f88c46ed4166983

    SHA256

    67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

    SHA512

    1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

  • C:\Users\Admin\AppData\Local\Temp\katE34.tmp

    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/1652-23-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-12-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-251-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-15-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-17-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-13-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-18-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-230-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-22-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-8-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-219-0x000000002ABD0000-0x000000002AE2F000-memory.dmp

    Filesize

    2.4MB

  • memory/1652-176-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1652-197-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1844-9-0x0000000003470000-0x00000000035B9000-memory.dmp

    Filesize

    1.3MB

  • memory/1844-0-0x0000000000220000-0x0000000000221000-memory.dmp

    Filesize

    4KB

  • memory/1844-20-0x0000000000400000-0x0000000000602000-memory.dmp

    Filesize

    2.0MB