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Analysis

  • max time kernel
    120s
  • max time network
    126s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    17/11/2023, 16:47

General

  • Target

    NEAS.70b2fbdbe34e05f0c3a84f5c9068e7f4970d7fa25452fa561357ca7d2e2be2ef.exe

  • Size

    269KB

  • MD5

    557a85c1233fd59bc4cc707b44231c6b

  • SHA1

    0e13d167bf632a8a65fb1ba5916af8c11e671872

  • SHA256

    70b2fbdbe34e05f0c3a84f5c9068e7f4970d7fa25452fa561357ca7d2e2be2ef

  • SHA512

    408a52244fffebbddc3bcb161ae2892596428e6d9938665f89bfcaf9e1ae865045a6f89c263169007ed559869b46ce3941ce0724d06dfe5dc50930597af01128

  • SSDEEP

    3072:7TfpODPLkwn2pBF4/Hu+FxIrPop3Cd2eEm0ThJ0ReN77xbnrrq5klzQEPdMFJyGX:ULkwn/O69p33ThZG

Malware Config

Extracted

Family

stealc

C2

http://bernardofata.icu

Attributes
  • url_path

    /40d570f44e84a454.php

rc4.plain

Signatures

  • Stealc

    Stealc is an infostealer written in C++.

  • Downloads MZ/PE file
  • Deletes itself 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.

  • 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 2 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\NEAS.70b2fbdbe34e05f0c3a84f5c9068e7f4970d7fa25452fa561357ca7d2e2be2ef.exe
    "C:\Users\Admin\AppData\Local\Temp\NEAS.70b2fbdbe34e05f0c3a84f5c9068e7f4970d7fa25452fa561357ca7d2e2be2ef.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2872
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\NEAS.70b2fbdbe34e05f0c3a84f5c9068e7f4970d7fa25452fa561357ca7d2e2be2ef.exe" & del "C:\ProgramData\*.dll"" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2424
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 5
        3⤵
        • Delays execution with timeout.exe
        PID:1424

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • \ProgramData\mozglue.dll

    Filesize

    593KB

    MD5

    c8fd9be83bc728cc04beffafc2907fe9

    SHA1

    95ab9f701e0024cedfbd312bcfe4e726744c4f2e

    SHA256

    ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

    SHA512

    fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

  • \ProgramData\nss3.dll

    Filesize

    2.0MB

    MD5

    1cc453cdf74f31e4d913ff9c10acdde2

    SHA1

    6e85eae544d6e965f15fa5c39700fa7202f3aafe

    SHA256

    ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

    SHA512

    dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

  • memory/2872-1-0x00000000002B0000-0x00000000003B0000-memory.dmp

    Filesize

    1024KB

  • memory/2872-2-0x00000000001C0000-0x00000000001DB000-memory.dmp

    Filesize

    108KB

  • memory/2872-3-0x0000000000400000-0x00000000008A9000-memory.dmp

    Filesize

    4.7MB

  • memory/2872-4-0x0000000000400000-0x00000000008A9000-memory.dmp

    Filesize

    4.7MB

  • memory/2872-5-0x0000000061E00000-0x0000000061EF3000-memory.dmp

    Filesize

    972KB

  • memory/2872-60-0x0000000000400000-0x00000000008A9000-memory.dmp

    Filesize

    4.7MB

  • memory/2872-69-0x00000000002B0000-0x00000000003B0000-memory.dmp

    Filesize

    1024KB

  • memory/2872-70-0x0000000000400000-0x00000000008A9000-memory.dmp

    Filesize

    4.7MB

  • memory/2872-71-0x00000000002B0000-0x00000000003B0000-memory.dmp

    Filesize

    1024KB