farfli | 836285f3e52df9a710d87ad9d34c58c25636d349b0a4230223f764a21a0ba07a

Analysis

max time kernel
150s
max time network
148s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
02/08/2026, 19:07

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General

Target
2026-08-02_30a2ccef24669f71ecbecc553a56f4e8_elex_wannacry.exe
Size 87KB
Sample260802-xs49pseq3s
SHA256 836285f3e52df9a710d87ad9d34c58c25636d349b0a4230223f764a21a0ba07a
MD5 30a2ccef24669f71ecbecc553a56f4e8
SHA1 b0f8e4066f8ae16682d1f45cf069f046f86e486f
SHA512 be1d6a74953ce812195592b2775d3900e0509a6fb0d9522e05c535d26095f4dc2a877671f234c958bdc9a43c8cc77b445bb72d9b810222d879b4ac9e4fa994d6
SSDEEP 1536:m/14ZaKO/myxZmAijMcCwVVydoM1bKAQAH9M53e+iWtnSd:a14ZaKOTZSMcJVgDKxAH9MhtfSd
TLSH
T17493CF232FBB4175DD449F711E6B2669E6F2BC36212082728B5CDD8DAA3CA45DB0131C
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery execution farfli persistence spyware stealer

Malware Config

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli

Detects Farfli Backdoor 3 IoCs

resource	yara_rule
behavioral2/memory/4944-11-0x0000000010000000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/4944-14-0x0000000010000000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/4944-15-0x0000000010000000-0x0000000010021000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/4944-11-0x0000000010000000-0x0000000010021000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4944-14-0x0000000010000000-0x0000000010021000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4944-15-0x0000000010000000-0x0000000010021000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 8 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
1	4944	rundll32.exe
2	4944	rundll32.exe
3	4944	rundll32.exe
4	4944	rundll32.exe
5	4944	rundll32.exe
6	4944	rundll32.exe
7	4944	rundll32.exe
8	4944	rundll32.exe

Deletes itself 1 IoCs

pid	Process
1996	vrhpscugn.exe

Executes dropped EXE 1 IoCs

pid	Process
1996	vrhpscugn.exe

Loads dropped DLL 1 IoCs

pid	Process
4944	rundll32.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\cyekserem\\yxunb.dll\",GetWindowClass"	rundll32.exe

Enumerates connected drives 3 TTPs 23 IoCs

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

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	rundll32.exe

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3548	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-02_30a2ccef24669f71ecbecc553a56f4e8_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vrhpscugn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3548	cmd.exe
4480	PING.EXE

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4480	PING.EXE

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4944	rundll32.exe
4944	rundll32.exe
4944	rundll32.exe
4944	rundll32.exe
4944	rundll32.exe
4944	rundll32.exe
4944	rundll32.exe
4944	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4944	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2688	2026-08-02_30a2ccef24669f71ecbecc553a56f4e8_elex_wannacry.exe
1996	vrhpscugn.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2688 wrote to memory of 3548	2688	2026-08-02_30a2ccef24669f71ecbecc553a56f4e8_elex_wannacry.exe	88
PID 3548 wrote to memory of 4480	3548	cmd.exe	90
PID 3548 wrote to memory of 1996	3548	cmd.exe	92
PID 1996 wrote to memory of 4944	1996	vrhpscugn.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-02_30a2ccef24669f71ecbecc553a56f4e8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_30a2ccef24669f71ecbecc553a56f4e8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2688
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\vrhpscugn.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-02_30a2ccef24669f71ecbecc553a56f4e8_elex_wannacry.exe"
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3548
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4480
- - \??\c:\vrhpscugn.exe
    c:\vrhpscugn.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-02_30a2ccef24669f71ecbecc553a56f4e8_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1996
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\cyekserem\yxunb.dll",GetWindowClass c:\vrhpscugn.exe
      4⤵
      Badlisted process makes network request
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4944

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

yxunb.dll

Path \??\c:\cyekserem\yxunb.dll
Size 43KB
SHA256 0b747c32730f2ad29b44299054bc22f8075702b081e91edaaead528abca227d2
MD5 0164aeb78f4d2181e817a9a6b0ad22f1
SHA1 c56c6a743e48e8652707a34e4cddc1f645f140ea
SHA512 e69ad90790d8062a903954f7ea85cacd241113afaf0eb16098f473835cffcda6e1f9fa9844a8618cc297fffa2e6ff7d458f9ebb2ce3febf7ffd683ffd6ad44f5
SSDEEP 768:2DdBa8mqIOiSUZrBGhvQLq6UYiaKRsRMwwY2BjkTrXW/VJZ581swUqHhiQREQoJs:kwqnPUb+v0q6UY+sRMwwY2Jkal+1ZUqJ
TLSH
T19613F133EACCDFDFF8A05271C576D0FCD337AC2849669A0395A0219D9D60948B878F66
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

vrhpscugn.exe

Path \??\c:\vrhpscugn.exe
Size 87KB
SHA256 71d4c93fcf737fef993f260572a94b803464ff90b29d741479989afa06f57d8a
MD5 6cc1153d7efb4cee11541d842791960c
SHA1 eeb22bb1c8fe9f684ef0207bb6dfe7fab0d903f0
SHA512 7bb3a15469aff87515d7082ca3dea81dc693bcafa32c4e44df76fa33a33d157f27836e02b05f63ac28077e2c44ff5cedd9f150bff92419b6601b24bd03f0f219
SSDEEP 1536:m/14ZaKO/myxZmAijMcCwVVydoM1bKAQAH9M53e+iWtnSdz:a14ZaKOTZSMcJVgDKxAH9MhtfSdz
TLSH
T1CD93CF232FBB4175DD449F711E6B2669E6F2BD36212082728B5C9D8DEA3CE45DB0131C
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1996-6-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/2688-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/2688-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4944-9-0x0000000010000000-0x0000000010021000-memory.dmp

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memory/4944-10-0x0000000001360000-0x0000000001362000-memory.dmp

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memory/4944-11-0x0000000010000000-0x0000000010021000-memory.dmp

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memory/4944-12-0x0000000001360000-0x0000000001362000-memory.dmp

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memory/4944-14-0x0000000010000000-0x0000000010021000-memory.dmp

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memory/4944-15-0x0000000010000000-0x0000000010021000-memory.dmp

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