Overview

overview

10

Static

static

7

libavresample-4.zip

windows10-2004-x64

10

libavresample-4.zip

windows11-21h2-x64

1

NexusChecker.exe

windows10-2004-x64

9

NexusChecker.exe

windows11-21h2-x64

9

freebl3.dll

windows10-2004-x64

1

freebl3.dll

windows11-21h2-x64

1

gkcodecs.dll

windows10-2004-x64

1

gkcodecs.dll

windows11-21h2-x64

1

libavresample-4.dll

windows10-2004-x64

3

libavresample-4.dll

windows11-21h2-x64

6

libavutil-56.dll

windows10-2004-x64

3

libavutil-56.dll

windows11-21h2-x64

3

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General

  • Target

    libavresample-4.zip

  • Size

    4.4MB

  • Sample

    240912-tey9rasfnl

  • MD5

    095b59d6465bf6491daccd0d4cf9baf0

  • SHA1

    b5d488cf23c1a6e6e7cfaa777657f8ad9a87ec32

  • SHA256

    35155e8468c1287a21e03699a55325378001fa060ee79a1db8f5b02e82adc33d

  • SHA512

    8aa151f915a6d2190246d0000ab5d2a27646fd925522cb334fb7273e93135c1becf4fd19980afccaf5730d5d178889a1b52acb012814ac6fc16dcb4dd781ef29

  • SSDEEP

    98304:c8luglqUM5DjX1SUeQAbWSFhMDC//X3yV8:/l4ZjFSpQAb1hK6c8

Score
10/10
exelastealercollectioncredential_accessdefense_evasiondiscoveryevasionexecutionpersistenceprivilege_escalationstealerthemidatrojanupx

Malware Config

Targets

    • Target

      libavresample-4.zip

    • Size

      4.4MB

    • MD5

      095b59d6465bf6491daccd0d4cf9baf0

    • SHA1

      b5d488cf23c1a6e6e7cfaa777657f8ad9a87ec32

    • SHA256

      35155e8468c1287a21e03699a55325378001fa060ee79a1db8f5b02e82adc33d

    • SHA512

      8aa151f915a6d2190246d0000ab5d2a27646fd925522cb334fb7273e93135c1becf4fd19980afccaf5730d5d178889a1b52acb012814ac6fc16dcb4dd781ef29

    • SSDEEP

      98304:c8luglqUM5DjX1SUeQAbWSFhMDC//X3yV8:/l4ZjFSpQAb1hK6c8

    Score
    10/10
    exelastealercollectioncredential_accessdefense_evasiondiscoveryevasionpersistenceprivilege_escalationstealerupx

    • Exela Stealer

      Exela Stealer is an open source stealer originally written in .NET and later transitioned to Python that was first observed in August 2023.

      stealerexelastealer

    • Credentials from Password Stores: Credentials from Web Browsers

      Malicious Access or copy of Web Browser Credential store.

      credential_accessstealer

    • Grants admin privileges

      Uses net.exe to modify the user's privileges.

    • Modifies Windows Firewall

      evasion

    • Clipboard Data

      Adversaries may collect data stored in the clipboard from users copying information within or between applications.

      collection

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

      upx

    • Adds Run key to start application

      persistence

    • Looks up external IP address via web service

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

    • Network Service Discovery

      Attempt to gather information on host's network.

      discovery

    • Enumerates processes with tasklist

      discovery

    • Hide Artifacts: Hidden Files and Directories

      defense_evasion
    behavioral1behavioral2

    • Target

      NexusChecker.exe

    • Size

      605.6MB

    • MD5

      2ba4db56200d2b07505c1eff5faed706

    • SHA1

      5cf6b2fcd1fd2f93a324151f86b124ea2bb94dd6

    • SHA256

      543fee52f65842ef6397ceca2b2516785103e93aecc58d340360ee76260684fa

    • SHA512

      59873ce651896d3a3fc11656b3e3a1e56b94be13bf7244521c29194d75517514325765a00e1da9189b15dd291b09b5fb43509d61599c4ea0fe77a053c5f988b1

    • SSDEEP

      49152:lNjqYcOatzfsFfG/oDx4tDhdLDG15f9pTo0trQyYxQw:lNjFcOaxYG/M43HA5fVt8Q

    Score
    9/10
    discoveryevasionexecutionthemidatrojan

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

      evasion

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

      execution

    • Checks BIOS information in registry

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

    • Checks computer location settings

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

    • Executes dropped EXE

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

      themida

    • Checks whether UAC is enabled

      evasiontrojan

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    behavioral3behavioral4

    • Target

      freebl3.dll

    • Size

      845KB

    • MD5

      662847f88f937be3b0e262891f3d7cb0

    • SHA1

      5bb6b578064308fc39eb5a69c02ea893d4fdc037

    • SHA256

      2eaded431adbfc17df0bb75d2706d527d14038f1f63aa85b41e2434ca3da9448

    • SHA512

      4efefa4df931fa4c1d982947966cb3e80a5a4a932877ba41234ccb7ed1a69fe7ae183bd172dcd1a969d5f7572e12f380f4c3aab6078b7971764afb72e23af145

    • SSDEEP

      12288:21wJLtapx8ThpZiwkeumCcN9XraJbJRPgUiZLoqnhhey:2KLtaATht7umCcN9XmJbJFriS+hhp

    Score
    1/10
    behavioral5behavioral6

    • Target

      gkcodecs.dll

    • Size

      462KB

    • MD5

      5b11259c1f70f005cc3138d076bc463f

    • SHA1

      b3d8355d0e805ef251e5639a411f815c25b1cbcf

    • SHA256

      50d8319352761bce751bb54c0a3d295691612b5b5a8fcfe687f1f6e690d0604d

    • SHA512

      8b0b78d5bfc034dfa1d3d237842f3ddc1638bb72292c3eb72748ab398ea5670a3703ecae7324262705b304cba7c28cb5d264316d747f480b68cf25bdfecb1aa5

    • SSDEEP

      12288:Ow2BLenEPdBA0BHCwyhleRMDgSx/FLZvb3kN:OLBMCDA0BCwyhleRMjx/FZc

    Score
    1/10
    behavioral7behavioral8

    • Target

      libavresample-4.dll

    • Size

      578KB

    • MD5

      43a5181dbc20f32106f44d9d493069c1

    • SHA1

      7f8d85c35f9d2af64c31050bda616743a9f6fe5b

    • SHA256

      69080064d63fa9724960c58767fde0a8202c101704241f0787f13359cc8eaa88

    • SHA512

      e85efc93b1746ff141e5f158db6fe7f314e2fe488581d0442733af36d2fcfbbd458522d327a38abc0ae20e55b2fbc7dd8ba54aaf7dbe9dc8c7439a9fea436ad2

    • SSDEEP

      12288:ox+wa4fcKToINMyVZBJm5QsW8N/raVikaNs1+gzPzjR/+ozEjLZvoSy7:dKzjRmvoN7

    Score
    6/10
    discoverypersistenceprivilege_escalation

    • Adds Run key to start application

      persistence

    • Drops desktop.ini file(s)

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

      persistenceprivilege_escalation
    behavioral10behavioral9

    • Target

      libavutil-56.dll

    • Size

      1.2MB

    • MD5

      7cdeb2075bde3b7cd500e50e87d291f1

    • SHA1

      7860db250f2cefb8e14cf8631a342d7cd489bba4

    • SHA256

      ca3b5aa8a79edeed61d7526e44b68c6968f15e074a0f767cf6cbfc148dfbf8c4

    • SHA512

      cc85f35454e8533e604da9296dfb74c27a6ed24b45b621fcaa308951a43dd83ff7a0f351f8930c9874920475ea13486010b01ee8712aee19cc9603e5da8b0eca

    • SSDEEP

      24576:JeNaqLQN99oBo9BmGTwWW1Ih2QQ4vROb46yk/5WA/:JeNJC9ko9BmGTBw4NGsO

    Score
    3/10
    discovery
    behavioral11behavioral12

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

2
T1059

PowerShell

1
T1059.001

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Persistence

Account Manipulation

1
T1098

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Event Triggered Execution

3
T1546

Change Default File Association

1
T1546.001

Component Object Model Hijacking

1
T1546.015

Netsh Helper DLL

1
T1546.007

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Account Manipulation

1
T1098

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Event Triggered Execution

3
T1546

Change Default File Association

1
T1546.001

Component Object Model Hijacking

1
T1546.015

Netsh Helper DLL

1
T1546.007

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Defense Evasion

Hide Artifacts

2
T1564

Hidden Files and Directories

2
T1564.001

Impair Defenses

1
T1562

Disable or Modify System Firewall

1
T1562.004

Modify Registry

3
T1112

Virtualization/Sandbox Evasion

1
T1497

Credential Access

Credentials from Password Stores

1
T1555

Credentials from Web Browsers

1
T1555.003

Discovery

Browser Information Discovery

1
T1217

Network Service Discovery

1
T1046

Peripheral Device Discovery

1
T1120

Permission Groups Discovery

1
T1069

Local Groups

1
T1069.001

Process Discovery

1
T1057

Query Registry

8
T1012

System Information Discovery

11
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

System Network Configuration Discovery

1
T1016

Wi-Fi Discovery

1
T1016.002

System Network Connections Discovery

1
T1049

Virtualization/Sandbox Evasion

1
T1497

Lateral Movement

Collection

Clipboard Data

1
T1115

Data from Local System

1
T1005

Command and Control

Exfiltration

Impact

Tasks