Analysis

  • max time kernel
    174s
  • max time network
    182s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    21-05-2022 03:21

General

  • Target

    Ekstre.exe

  • Size

    1.2MB

  • MD5

    89f1f5656da031a2efc09c53e4be99de

  • SHA1

    889b3da7c04df4f5ada7c3ee11742854399e20b0

  • SHA256

    18dce314a1d5ad6712fd2b1f80955c00155ec16e66e1039ac77c1849aa913577

  • SHA512

    39b8e7b71f13e486db5032057a4d3bf9cce5ff407eda21f802d782f66e53f924e2dab3b6244341c94d7fe273643cfcd96eecf3affefca3cccfeedcf031062c81

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\F293CD6622\Log.txt

Family

masslogger

Ransom Note
<|| v2.1.0.0 ||> User Name: Admin IP: 154.61.71.50 Location: United States Windows OS: Microsoft Windows 10 Pro 64bit Windows Serial Key: W269N-WFGWX-YVC9B-4J6C9-T83GX CPU: Intel Core Processor (Broadwell) GPU: Microsoft Basic Display Adapter AV: NA Screen Resolution: 1280x720 Current Time: 5/21/2022 7:02:25 AM MassLogger Started: 5/21/2022 7:02:19 AM Interval: 2 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\RegAsm.exe MassLogger Melt: false MassLogger Exit after delivery: false As Administrator: True Processes: <|| WD Exclusion ||> Disabled <|| Binder ||> Disabled <|| Downloader ||> Disabled <|| USB Spread ||> Disabled <|| Window Searcher ||> Disabled <|| Bot Killer ||> Disabled <|| Search And Upload ||> Disabled <|| Telegram Desktop ||> Not Installed <|| Pidgin ||> Not Installed <|| FileZilla ||> Not Installed <|| Discord Tokken ||> Not Installed <|| NordVPN ||> Not Installed <|| Outlook ||> Not Installed <|| FoxMail ||> Not Installed <|| Thunderbird ||> Not Installed <|| FireFox ||> Not Found <|| QQ Browser ||> Not Installed <|| Chromium Recovery ||> Not Installed or Not Found <|| Keylogger And Clipboard ||> Disabled

Signatures

  • MassLogger

    Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.

  • MassLogger Main Payload 4 IoCs
  • MassLogger log file 1 IoCs

    Detects a log file produced by MassLogger.

  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses Microsoft Outlook profiles 1 TTPs 42 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 26 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Ekstre.exe
    "C:\Users\Admin\AppData\Local\Temp\Ekstre.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2840
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v admin /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\Desktop\.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4632
      • C:\Windows\SysWOW64\reg.exe
        REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v admin /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\Desktop\.exe"
        3⤵
        • Adds Run key to start application
        PID:4452
    • C:\Users\Admin\Desktop\.exe
      "C:\Users\Admin\Desktop\.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1700
      • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
        "C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Accesses Microsoft Outlook profiles
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • outlook_office_path
        • outlook_win_path
        PID:4508

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

1
T1112

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

1
T1005

Email Collection

1
T1114

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
    Filesize

    63KB

    MD5

    0d5df43af2916f47d00c1573797c1a13

    SHA1

    230ab5559e806574d26b4c20847c368ed55483b0

    SHA256

    c066aee7aa3aa83f763ebc5541daa266ed6c648fbffcde0d836a13b221bb2adc

    SHA512

    f96cf9e1890746b12daf839a6d0f16f062b72c1b8a40439f96583f242980f10f867720232a6fa0f7d4d7ac0a7a6143981a5a130d6417ea98b181447134c7cfe2

  • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
    Filesize

    63KB

    MD5

    0d5df43af2916f47d00c1573797c1a13

    SHA1

    230ab5559e806574d26b4c20847c368ed55483b0

    SHA256

    c066aee7aa3aa83f763ebc5541daa266ed6c648fbffcde0d836a13b221bb2adc

    SHA512

    f96cf9e1890746b12daf839a6d0f16f062b72c1b8a40439f96583f242980f10f867720232a6fa0f7d4d7ac0a7a6143981a5a130d6417ea98b181447134c7cfe2

  • C:\Users\Admin\Desktop\.exe
    Filesize

    1.2MB

    MD5

    89f1f5656da031a2efc09c53e4be99de

    SHA1

    889b3da7c04df4f5ada7c3ee11742854399e20b0

    SHA256

    18dce314a1d5ad6712fd2b1f80955c00155ec16e66e1039ac77c1849aa913577

    SHA512

    39b8e7b71f13e486db5032057a4d3bf9cce5ff407eda21f802d782f66e53f924e2dab3b6244341c94d7fe273643cfcd96eecf3affefca3cccfeedcf031062c81

  • C:\Users\Admin\Desktop\.exe
    Filesize

    1.2MB

    MD5

    89f1f5656da031a2efc09c53e4be99de

    SHA1

    889b3da7c04df4f5ada7c3ee11742854399e20b0

    SHA256

    18dce314a1d5ad6712fd2b1f80955c00155ec16e66e1039ac77c1849aa913577

    SHA512

    39b8e7b71f13e486db5032057a4d3bf9cce5ff407eda21f802d782f66e53f924e2dab3b6244341c94d7fe273643cfcd96eecf3affefca3cccfeedcf031062c81

  • memory/1700-135-0x0000000000000000-mapping.dmp
  • memory/2840-131-0x0000000005990000-0x0000000005F34000-memory.dmp
    Filesize

    5.6MB

  • memory/2840-132-0x00000000052D0000-0x0000000005362000-memory.dmp
    Filesize

    584KB

  • memory/2840-130-0x0000000000780000-0x00000000008B4000-memory.dmp
    Filesize

    1.2MB

  • memory/4452-134-0x0000000000000000-mapping.dmp
  • memory/4508-138-0x0000000000000000-mapping.dmp
  • memory/4508-139-0x0000000000400000-0x000000000049A000-memory.dmp
    Filesize

    616KB

  • memory/4508-142-0x0000000004E30000-0x0000000004ECC000-memory.dmp
    Filesize

    624KB

  • memory/4508-143-0x0000000004F40000-0x0000000004FA6000-memory.dmp
    Filesize

    408KB

  • memory/4508-144-0x0000000006860000-0x000000000686A000-memory.dmp
    Filesize

    40KB

  • memory/4508-145-0x00000000069A0000-0x00000000069F0000-memory.dmp
    Filesize

    320KB

  • memory/4632-133-0x0000000000000000-mapping.dmp