Analysis

  • max time kernel
    120s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    22-05-2024 01:11

General

  • Target

    75a414c059c9037deecff0b3438ff11bc0bd4ce9668b502263ea20ab0265bcf0.exe

  • Size

    2.0MB

  • MD5

    505cd3c074186e050537b91bd31a201f

  • SHA1

    227b09b536de6c9c7380ec293e5b6fa563af5270

  • SHA256

    75a414c059c9037deecff0b3438ff11bc0bd4ce9668b502263ea20ab0265bcf0

  • SHA512

    578648e9c99138bbcb540e081a89cfa768288c88c8d36269f5761d1ab2053fdcdd636a98a76cbf077dbd5e28e0968465a831e5d90e4f5f4e3121e52658c02978

  • SSDEEP

    49152:IFno/jfoJtTF+TxMoxc1TU+j+dAzGkiT:IFno/jAtIuoITsdZT

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\75a414c059c9037deecff0b3438ff11bc0bd4ce9668b502263ea20ab0265bcf0.exe
    "C:\Users\Admin\AppData\Local\Temp\75a414c059c9037deecff0b3438ff11bc0bd4ce9668b502263ea20ab0265bcf0.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2364
    • C:\Users\Admin\AppData\Local\Temp\kat657.tmp
      C:\Users\Admin\AppData\Local\Temp\kat657.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      PID:1076

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    68KB

    MD5

    29f65ba8e88c063813cc50a4ea544e93

    SHA1

    05a7040d5c127e68c25d81cc51271ffb8bef3568

    SHA256

    1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

    SHA512

    e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\F0ACCF77CDCBFF39F6191887F6D2D357

    Filesize

    1KB

    MD5

    a266bb7dcc38a562631361bbf61dd11b

    SHA1

    3b1efd3a66ea28b16697394703a72ca340a05bd5

    SHA256

    df545bf919a2439c36983b54cdfc903dfa4f37d3996d8d84b4c31eec6f3c163e

    SHA512

    0da8ef4f8f6ed3d16d2bc8eb816b9e6e1345dfe2d91160196c47e6149a1d6aedaafadcefd66acdea7f72dcf0832770192ceac15b0c559c4ccc2c0e5581d5aefc

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\F0ACCF77CDCBFF39F6191887F6D2D357

    Filesize

    242B

    MD5

    adcc0f96fc5dfe72d92108371f31de56

    SHA1

    a6fdeca3467c23e36a74fe457bc583e16d26196d

    SHA256

    57b5d2b4969a2968bb19e32194a0b2901cdd76fd4047a800857d50df7db181f3

    SHA512

    a73dfe6e7047e78fc0b77685a01c745ef4f79b2032667b9b48c12c2ee6d49c62f871f6d2a0b9b9fe10623b017789012982d920696daed454d961639497feefdc

  • C:\Users\Admin\AppData\Local\Temp\TarB7B.tmp

    Filesize

    177KB

    MD5

    435a9ac180383f9fa094131b173a2f7b

    SHA1

    76944ea657a9db94f9a4bef38f88c46ed4166983

    SHA256

    67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

    SHA512

    1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

  • \Users\Admin\AppData\Local\Temp\kat657.tmp

    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/1076-13-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-248-0x000000002AC70000-0x000000002AECF000-memory.dmp

    Filesize

    2.4MB

  • memory/1076-23-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-17-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-18-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-15-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-22-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-288-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-11-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-9-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-263-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-197-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/1076-222-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/2364-0-0x0000000000310000-0x0000000000311000-memory.dmp

    Filesize

    4KB

  • memory/2364-1-0x00000000032A0000-0x00000000033E9000-memory.dmp

    Filesize

    1.3MB

  • memory/2364-20-0x0000000000400000-0x0000000000602000-memory.dmp

    Filesize

    2.0MB