farfli | 03550f42dc2c3c3eb1cb88e93bfef07926665958dc7ba479d046b9173858ba92

Analysis

max time kernel
150s
max time network
146s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
24/10/2026, 10:31

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General

Target
2026-10-22_66b459c003b51f050a9d228c573a83de_elex_wannacry.exe
Size 111KB
Sample261024-mkrcrsa19p
SHA256 03550f42dc2c3c3eb1cb88e93bfef07926665958dc7ba479d046b9173858ba92
MD5 66b459c003b51f050a9d228c573a83de
SHA1 4276aa7e8f79829b69e0af53e87aaf869e6e1c4d
SHA512 5d15a297555f0f650124f8dc261687db347409665afe26e03d623ed03d3df8f8d1ea9a4c693986b5daac435fd13e9e694936cafae2652dcd6d101406d4e94c12
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX4:piAXaKDeKNnD36cb8tI
TLSH
T1D6B39D12ABF0C7A5E0625CB5067757619EB2FC6A2934872777D6B70EAC30F00EE21355
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit defense_evasion 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/5020-9-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/5020-10-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli
behavioral2/memory/5020-11-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/5020-12-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/5020-9-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5020-11-0x0000000010000000-0x000000001002E000-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
7	5020	rundll32.exe
8	5020	rundll32.exe
9	5020	rundll32.exe
11	5020	rundll32.exe
12	5020	rundll32.exe
14	5020	rundll32.exe
15	5020	rundll32.exe
17	5020	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
1428	ougkf.exe

Executes dropped EXE 1 IoCs

pid	Process
1428	ougkf.exe

Loads dropped DLL 1 IoCs

pid	Process
5020	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-1-5-21-2714045687-1127350534-2056456672-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\prowj\\vakngaub.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)	\??\u:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	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)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	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
724	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	rundll32.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	rundll32.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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-22_66b459c003b51f050a9d228c573a83de_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	ougkf.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
724	cmd.exe
5668	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
5668	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5020	rundll32.exe
5020	rundll32.exe
5020	rundll32.exe
5020	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5020	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4764	2026-10-22_66b459c003b51f050a9d228c573a83de_elex_wannacry.exe
1428	ougkf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4764 wrote to memory of 724	4764	2026-10-22_66b459c003b51f050a9d228c573a83de_elex_wannacry.exe	90
PID 724 wrote to memory of 5668	724	cmd.exe	92
PID 724 wrote to memory of 1428	724	cmd.exe	93
PID 1428 wrote to memory of 5020	1428	ougkf.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-22_66b459c003b51f050a9d228c573a83de_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_66b459c003b51f050a9d228c573a83de_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4764
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\ougkf.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-22_66b459c003b51f050a9d228c573a83de_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:724
- - 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:5668
- - \??\c:\ougkf.exe
    c:\ougkf.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-22_66b459c003b51f050a9d228c573a83de_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1428
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\prowj\vakngaub.dll",GetWindowClass c:\ougkf.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)
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:5020

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

Indicator Removal

T1070

File Deletion

T1070.004

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

ougkf.exe

Path \??\c:\ougkf.exe
Size 111KB
SHA256 061502dfb7de0c307f4a1e2df8e4da8ede5107559fb862996dedfc4e2a2b2345
MD5 b228fc49588c80aba69bc1a300f8e016
SHA1 b3ab0df25c1854c4b588b2ee591394420b8e6aeb
SHA512 f34a84a020111be0e90d11e0ace6a045abe2d7455fde1c81829e70d7f3d66a5b12891a5434d9643b4e7ef8176b122c0e2f924a307433a822f03f2ca27610c40b
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX4p:piAXaKDeKNnD36cb8tIp
TLSH
T1A2B39D12ABF0C7A5E0625CB506775B619EB2FC2A2934872777D6B70EAC30F00EE25355
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

vakngaub.dll

Path \??\c:\prowj\vakngaub.dll
Size 46KB
SHA256 f57f9e54f4774c2b944fb070ae0c2a02cbb4b7686ab3207544c3ccaff0ff3dd9
MD5 a3fd41430ddcaa55fde840788925406a
SHA1 dbdd87f5c1bbf6a6f44c2e2c4744675d5e4e75c2
SHA512 23109572cfc9a282ea3ec84d93bfe02303d27f365ad2d9f47f6234f91da14c64f80133cc5e49746dfcb65d2454b7e7c13eff59ba4bbc18e09d2fb1c630ba59c9
SSDEEP 768:2sUfnvxs6iLlhpfFPtnQf7kifD/v7yb9Bh7Cb0VQJojZC/xjTk:2sJT1qf4W/vub9nnV1jZC/xE
TLSH
T19D2302C8A6F08EF3D2F90B7980E046DCDCFDB939877381150566008E7C71057FA446AA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1428-6-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/4764-0-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/4764-2-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/5020-9-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/5020-10-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/5020-11-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/5020-12-0x0000000010001000-0x000000001001E000-memory.dmp

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