farfli | 6088c50e7c190204446c4c6c43b48426f9d66c928e2a1a77f5e97cc23974f4b8

Analysis

max time kernel
148s
max time network
147s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260710-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
20/07/2026, 11:59

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General

Target
2026-07-20_1ca3d7d30ea23e9f9eacf2a271f477bf_elex_wannacry.exe
Size 97KB
Sample260720-n565dsbv81
SHA256 6088c50e7c190204446c4c6c43b48426f9d66c928e2a1a77f5e97cc23974f4b8
MD5 1ca3d7d30ea23e9f9eacf2a271f477bf
SHA1 992a92ca253c1c8ea66006c64820c0063562c4aa
SHA512 008f3906367b0ede8a9cb12f6e4fed0ddecd5829b9c2f12fdf6e0378f75d3364957c5dd5b788a09a822e739593d7165422b7a2a9c41f6ad83ad5396a28b5d226
SSDEEP 3072:eSABNx6vb4RoI4pyjHYLhal01UoPX+hwo6S:el69Ml0TEZ
TLSH
T139A3AF03ABA589D9F5216C30562E773087BFA85D3F1457639348EE4EE437D81EC3628A
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 4 IoCs

resource	yara_rule
behavioral2/memory/3864-9-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli
behavioral2/memory/3864-10-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/3864-11-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli
behavioral2/memory/3864-12-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/3864-9-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3864-11-0x0000000010000000-0x0000000010032000-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
5	3864	rundll32.exe
7	3864	rundll32.exe
6	3864	rundll32.exe
11	3864	rundll32.exe
12	3864	rundll32.exe
13	3864	rundll32.exe
15	3864	rundll32.exe
16	3864	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000e00000001c5b3-7.dat	acprotect

Deletes itself 1 IoCs

pid	Process
1780	uvguw.exe

Executes dropped EXE 1 IoCs

pid	Process
1780	uvguw.exe

Loads dropped DLL 1 IoCs

pid	Process
3864	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-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\uyxwz\\knbkdt.dll\",DoVirusScan"	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)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
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)	\??\y:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\s:	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
4328	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	uvguw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-20_1ca3d7d30ea23e9f9eacf2a271f477bf_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

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
4328	cmd.exe
4640	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
4640	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3864	rundll32.exe
3864	rundll32.exe
3864	rundll32.exe
3864	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3864	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4124	2026-07-20_1ca3d7d30ea23e9f9eacf2a271f477bf_elex_wannacry.exe
1780	uvguw.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4124 wrote to memory of 4328	4124	2026-07-20_1ca3d7d30ea23e9f9eacf2a271f477bf_elex_wannacry.exe	89
PID 4328 wrote to memory of 4640	4328	cmd.exe	91
PID 4328 wrote to memory of 1780	4328	cmd.exe	92
PID 1780 wrote to memory of 3864	1780	uvguw.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-20_1ca3d7d30ea23e9f9eacf2a271f477bf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_1ca3d7d30ea23e9f9eacf2a271f477bf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4124
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\uvguw.exe "C:\Users\Admin\AppData\Local\Temp\2026-07-20_1ca3d7d30ea23e9f9eacf2a271f477bf_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:4328
- - 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:4640
- - \??\c:\uvguw.exe
    c:\uvguw.exe "C:\Users\Admin\AppData\Local\Temp\2026-07-20_1ca3d7d30ea23e9f9eacf2a271f477bf_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1780
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\uyxwz\knbkdt.dll",DoVirusScan c:\uvguw.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:3864

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

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Downloads

uvguw.exe

Path \??\c:\uvguw.exe
Size 97KB
SHA256 dceb41bed0a5b6b892c641f0fd1d6bd59f4e98716d91198bf68b915076013842
MD5 d2086f617c81cfe30c197ae49f0d670d
SHA1 85f85617214cec19f1c232e9a23034164a0fbbe2
SHA512 e54fb256e12217a541933bfa1b9d9715685a885e974846be13bd8e14fe1f8b487abdaef78b53826866c09dbd1ec003ff9f7b06d0381e03eb15d116c49237d81a
SSDEEP 3072:eSABNx6vb4RoI4pyjHYLhal01UoPX+hwo6z:el69Ml0TEU
TLSH
T11DA3AE03ABA589C9F5217C70562E773087BEA85D3F1457639348EE4EE437D81EC3628A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

knbkdt.dll

Path \??\c:\uyxwz\knbkdt.dll
Size 50KB
SHA256 b2d21c40c5bfc0f7695945946fa1cdd4eaf2f66a8391ddde6307c5f765fbf525
MD5 cbfc06794d16ace6adf42210183fc1b9
SHA1 74fc68a2af225b0aca954b3684940747511013c5
SHA512 181dbe8b63e28a81cb8e0b7240df8745da350e1ab433b157b8b4fd36aa10f0782e807c09563bcffe37cfe64aa1b514b2cc1f179fbcba422d96867179d88e13c9
SSDEEP 768:Z+arYIR3u5v4bGwCl56LNQQe5JBtGf1oTYtx/qQvorLOpqPJ/UP2Gy+OIudD05:ZPrG57TzDxJS6Etx/Zv2OwSy+OIOD05
TLSH
T15733F1ACE2F064F5D0AF6B345952225CF5C26F238D3190DB4A8214BF3C32A5B5B5E721
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1780-6-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/3864-9-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/3864-10-0x0000000010001000-0x0000000010021000-memory.dmp

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memory/3864-11-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/3864-12-0x0000000010001000-0x0000000010021000-memory.dmp

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memory/4124-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4124-2-0x0000000000400000-0x0000000000417000-memory.dmp

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