Overview

overview

10

Static

static

3

jaffacakes...uh.exe

windows10-2004-x64

10

jaffacakes...uh.exe

windows11-ltsc_2024-x64

10

Sharing

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General

  • Target
    jaffacakes118_Trojan.Win32.Chydo.cuh.1005be331a6d94f7ab6e2cb7ce11a0ec
  • Size 532KB
  • Sample261018-2d8e2abt8v
  • SHA256 263d71dcb8c1e2a5172cf9224961d55777312e7a4fcdeb97b4a2d18f05955873
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
pykspadefense_evasiondiscoverypersistenceprivilege_escalationtrojanworm

Malware Config

Targets

    • Target
      jaffacakes118_Trojan.Win32.Chydo.cuh.1005be331a6d94f7ab6e2cb7ce11a0ec
    • Size 532KB
    • SHA256 263d71dcb8c1e2a5172cf9224961d55777312e7a4fcdeb97b4a2d18f05955873
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    defense_evasiondiscoverypykspapersistenceprivilege_escalationtrojanworm

    • Detect Pykspa worm

      worm

    • Family: Pykspa

      Pykspa is a worm spreads via Skype uses DGA and it's written in C++.

      wormpykspa

    • Modifies WinLogon for persistence

      persistence

    • UAC bypass

      defense_evasiontrojan

    • Adds policy Run key to start application

      persistence

    • Disables RegEdit via registry modification

      defense_evasion

    • Checks computer location settings

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

    • Executes dropped EXE

    • Impair Defenses: Safe Mode Boot

      defense_evasion

    • Adds Run key to start application

      persistence

    • Checks whether UAC is enabled

      defense_evasiontrojan

    • Hijack Execution Flow: Executable Installer File Permissions Weakness

      Possible Turn off User Account Control's privilege elevation for standard users.

      defense_evasionpersistenceprivilege_escalation

    • Looks up external IP address via web service

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

      discovery

    • Drops autorun.inf file

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

    • Drops file in System32 directory

    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Replication Through Removable Media

1
T1091

Execution

Persistence

Boot or Logon Autostart Execution

3
T1547

Registry Run Keys / Startup Folder

2
T1547.001

Winlogon Helper DLL

1
T1547.004

Hijack Execution Flow

1
T1574

Executable Installer File Permissions Weakness

1
T1574.005

Privilege Escalation

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Boot or Logon Autostart Execution

3
T1547

Registry Run Keys / Startup Folder

2
T1547.001

Winlogon Helper DLL

1
T1547.004

Hijack Execution Flow

1
T1574

Executable Installer File Permissions Weakness

1
T1574.005

Defense Evasion

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Hijack Execution Flow

1
T1574

Executable Installer File Permissions Weakness

1
T1574.005

Impair Defenses

2
T1562

Disable or Modify Tools

1
T1562.001

Safe Mode Boot

1
T1562.009

Modify Registry

5
T1112

Credential Access

Discovery

Query Registry

1
T1012

System Information Discovery

3
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

System Network Configuration Discovery

2
T1016

Internet Connection Discovery

1
T1016.001

Lateral Movement

Replication Through Removable Media

1
T1091

Collection

Command and Control

Exfiltration

Impact

Tasks