Analysis

  • max time kernel
    151s
  • max time network
    144s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    11-07-2022 12:18

General

  • Target

    Cryptded_protected.exe

  • Size

    1.5MB

  • MD5

    fc24752914e03759c7cc97e560154868

  • SHA1

    9790816345ee7f10a0336f4013864c565c75de89

  • SHA256

    a0de3c7f5026e72496e15c3fcb24947aa54e2d615bed91bc8f44fd07a2553b44

  • SHA512

    7a7082c640fbcb54a9247848dde589258a7182ff2284c166372465f5d7a76ab3ce89cc7d98bba9fab3a670957655e8fb0337cd7f836cc1f88ccfe6aa980f904e

Malware Config

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/963884131157168128/l7y0A3as75Se94o7XMk4zXPVahSSRfUXKz2j0cONgRgga6ZiO0oAtr3nqCmT9TlwHPnJ

Signatures

  • 44Caliber

    An open source infostealer written in C#.

  • njRAT/Bladabindi

    Widely used RAT written in .NET.

  • Executes dropped EXE 3 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Drops startup file 2 IoCs
  • Loads dropped DLL 3 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
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Drops autorun.inf file 1 TTPs 3 IoCs

    Malware can abuse Windows Autorun to spread further via attached volumes.

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

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 22 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Cryptded_protected.exe
    "C:\Users\Admin\AppData\Local\Temp\Cryptded_protected.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1400
    • C:\Users\Admin\AppData\Local\Temp\Umbrella.flv.exe
      "C:\Users\Admin\AppData\Local\Temp\Umbrella.flv.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:1448
      • C:\Users\Admin\AppData\Roaming\svhost.exe
        "C:\Users\Admin\AppData\Roaming\svhost.exe"
        3⤵
        • Executes dropped EXE
        • Drops startup file
        • Adds Run key to start application
        • Drops autorun.inf file
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1236
        • C:\Windows\SysWOW64\netsh.exe
          netsh firewall add allowedprogram "C:\Users\Admin\AppData\Roaming\svhost.exe" "svhost.exe" ENABLE
          4⤵
          • Modifies Windows Firewall
          PID:1536
        • C:\Windows\SysWOW64\taskkill.exe
          taskkill /F /IM Exsample.exe
          4⤵
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:320
    • C:\Users\Admin\AppData\Local\Temp\Insidious (2).exe
      "C:\Users\Admin\AppData\Local\Temp\Insidious (2).exe"
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:948
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" $file='C:\Users\Admin\AppData\Local\Temp\Cryptded_protected.exe';for($i=1;$i -le 600 -and (Test-Path $file -PathType leaf);$i++){Remove-Item $file;Start-Sleep -m 100}
      2⤵
      • Deletes itself
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1700

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Replication Through Removable Media

1
T1091

Persistence

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

1
T1112

Credential Access

Credentials in Files

2
T1081

Discovery

System Information Discovery

2
T1082

Query Registry

1
T1012

Lateral Movement

Replication Through Removable Media

1
T1091

Collection

Data from Local System

2
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\Insidious (2).exe
    Filesize

    252KB

    MD5

    d7595446b3398cd3f737047a2ea51e6b

    SHA1

    3149f2afed1ee0b7b64afcd0ddfe52b982c07983

    SHA256

    a09ef6e960ea808cfd8d3031957e7d8213b03b8ce37e2cafe905d43965635975

    SHA512

    dc95b3a9117f1e52e735b316a2828e649a904120c604505d071d70f5fdeba40396f1de8f39292e9651deeed6fcb2447026c63383491b080abb9416839bbcd00c

  • C:\Users\Admin\AppData\Local\Temp\Insidious (2).exe
    Filesize

    252KB

    MD5

    d7595446b3398cd3f737047a2ea51e6b

    SHA1

    3149f2afed1ee0b7b64afcd0ddfe52b982c07983

    SHA256

    a09ef6e960ea808cfd8d3031957e7d8213b03b8ce37e2cafe905d43965635975

    SHA512

    dc95b3a9117f1e52e735b316a2828e649a904120c604505d071d70f5fdeba40396f1de8f39292e9651deeed6fcb2447026c63383491b080abb9416839bbcd00c

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

    36KB

    MD5

    e99f837607cb3c47ea0a29cf3e3243f5

    SHA1

    c94b04439c4151bdd0482df65699c2e516b2eff2

    SHA256

    4d92d5b42d93bfadff3454236d10a2ff63bb02dbe0332ea83db215df6ded55bb

    SHA512

    6b7dbfb18395199ae3416d7aeaf18d4b0d3e1fc0168c09cf4f4ec95a7e451121dbf8ba1e4ed2a95ccdcbb56cf27502648308b7fb7a0e33272bdcb9f2aa55f853

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

    36KB

    MD5

    e99f837607cb3c47ea0a29cf3e3243f5

    SHA1

    c94b04439c4151bdd0482df65699c2e516b2eff2

    SHA256

    4d92d5b42d93bfadff3454236d10a2ff63bb02dbe0332ea83db215df6ded55bb

    SHA512

    6b7dbfb18395199ae3416d7aeaf18d4b0d3e1fc0168c09cf4f4ec95a7e451121dbf8ba1e4ed2a95ccdcbb56cf27502648308b7fb7a0e33272bdcb9f2aa55f853

  • C:\Users\Admin\AppData\Roaming\svhost.exe
    Filesize

    36KB

    MD5

    e99f837607cb3c47ea0a29cf3e3243f5

    SHA1

    c94b04439c4151bdd0482df65699c2e516b2eff2

    SHA256

    4d92d5b42d93bfadff3454236d10a2ff63bb02dbe0332ea83db215df6ded55bb

    SHA512

    6b7dbfb18395199ae3416d7aeaf18d4b0d3e1fc0168c09cf4f4ec95a7e451121dbf8ba1e4ed2a95ccdcbb56cf27502648308b7fb7a0e33272bdcb9f2aa55f853

  • C:\Users\Admin\AppData\Roaming\svhost.exe
    Filesize

    36KB

    MD5

    e99f837607cb3c47ea0a29cf3e3243f5

    SHA1

    c94b04439c4151bdd0482df65699c2e516b2eff2

    SHA256

    4d92d5b42d93bfadff3454236d10a2ff63bb02dbe0332ea83db215df6ded55bb

    SHA512

    6b7dbfb18395199ae3416d7aeaf18d4b0d3e1fc0168c09cf4f4ec95a7e451121dbf8ba1e4ed2a95ccdcbb56cf27502648308b7fb7a0e33272bdcb9f2aa55f853

  • \Users\Admin\AppData\Local\Temp\Insidious (2).exe
    Filesize

    252KB

    MD5

    d7595446b3398cd3f737047a2ea51e6b

    SHA1

    3149f2afed1ee0b7b64afcd0ddfe52b982c07983

    SHA256

    a09ef6e960ea808cfd8d3031957e7d8213b03b8ce37e2cafe905d43965635975

    SHA512

    dc95b3a9117f1e52e735b316a2828e649a904120c604505d071d70f5fdeba40396f1de8f39292e9651deeed6fcb2447026c63383491b080abb9416839bbcd00c

  • \Users\Admin\AppData\Local\Temp\Umbrella.flv.exe
    Filesize

    36KB

    MD5

    e99f837607cb3c47ea0a29cf3e3243f5

    SHA1

    c94b04439c4151bdd0482df65699c2e516b2eff2

    SHA256

    4d92d5b42d93bfadff3454236d10a2ff63bb02dbe0332ea83db215df6ded55bb

    SHA512

    6b7dbfb18395199ae3416d7aeaf18d4b0d3e1fc0168c09cf4f4ec95a7e451121dbf8ba1e4ed2a95ccdcbb56cf27502648308b7fb7a0e33272bdcb9f2aa55f853

  • \Users\Admin\AppData\Roaming\svhost.exe
    Filesize

    36KB

    MD5

    e99f837607cb3c47ea0a29cf3e3243f5

    SHA1

    c94b04439c4151bdd0482df65699c2e516b2eff2

    SHA256

    4d92d5b42d93bfadff3454236d10a2ff63bb02dbe0332ea83db215df6ded55bb

    SHA512

    6b7dbfb18395199ae3416d7aeaf18d4b0d3e1fc0168c09cf4f4ec95a7e451121dbf8ba1e4ed2a95ccdcbb56cf27502648308b7fb7a0e33272bdcb9f2aa55f853

  • memory/320-81-0x0000000000000000-mapping.dmp
  • memory/948-70-0x0000000001290000-0x00000000012D6000-memory.dmp
    Filesize

    280KB

  • memory/948-62-0x0000000000000000-mapping.dmp
  • memory/1236-83-0x0000000073010000-0x00000000735BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1236-78-0x0000000073010000-0x00000000735BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1236-73-0x0000000000000000-mapping.dmp
  • memory/1400-67-0x0000000000400000-0x00000000007D5000-memory.dmp
    Filesize

    3.8MB

  • memory/1400-55-0x0000000000400000-0x00000000007D5000-memory.dmp
    Filesize

    3.8MB

  • memory/1400-56-0x0000000000400000-0x00000000007D5000-memory.dmp
    Filesize

    3.8MB

  • memory/1400-54-0x0000000075E41000-0x0000000075E43000-memory.dmp
    Filesize

    8KB

  • memory/1448-71-0x0000000073010000-0x00000000735BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1448-77-0x0000000073010000-0x00000000735BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1448-58-0x0000000000000000-mapping.dmp
  • memory/1536-80-0x0000000000000000-mapping.dmp
  • memory/1700-79-0x0000000073010000-0x00000000735BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1700-69-0x0000000073010000-0x00000000735BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1700-66-0x0000000000000000-mapping.dmp