farfli | b016e0da12650a927e6292e95737a61f00e640ac4e0a2b7eae7c72b17ee67497

Analysis

max time kernel
149s
max time network
147s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
03/05/2026, 13:09

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General

Target
2026-05-03_1009c08b46949bcba34883258cfb4607_elex_wannacry.exe
Size 90KB
Sample260503-qdvndsc13p
SHA256 b016e0da12650a927e6292e95737a61f00e640ac4e0a2b7eae7c72b17ee67497
MD5 1009c08b46949bcba34883258cfb4607
SHA1 37b1666aa6a5c66ae422f75b28c01b2ba94abdda
SHA512 d1e6b51e4ca423604aeac112db1c342c2ca62ef0bc73c3c6b2c0cb9e41ce26f4955375411480e47652dafcdbcee089a7102e89a0759d3a884ead67991e34899a
SSDEEP 1536:TSSABNx6vb4RoI47zzzzzzzzzvfxzVzNrzzzgzzzzzzzzzzzzzzzz6zzzdzzzzlB:eSABNx6vb4RoI4pyjHYLhal01UoPX+h0
TLSH
T13393CF07ABA948C9F221BC30156E3B7587BF985D7F1457979348EE4E9433D80EC3628A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery 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/4936-10-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli
behavioral2/memory/4936-11-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/4936-12-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli
behavioral2/memory/4936-13-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4936-10-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4936-12-0x0000000010000000-0x0000000010032000-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
2	4936	rundll32.exe
3	4936	rundll32.exe
4	4936	rundll32.exe
5	4936	rundll32.exe
6	4936	rundll32.exe
7	4936	rundll32.exe
9	4936	rundll32.exe
10	4936	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x001a00000002b456-9.dat	acprotect

Deletes itself 1 IoCs

pid	Process
4296	klnfx.exe

Executes dropped EXE 1 IoCs

pid	Process
4296	klnfx.exe

Loads dropped DLL 1 IoCs

pid	Process
4936	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-1-5-21-3119821332-640943685-2562343641-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\wwpwv\\ofzwf.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)	\??\g:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\i:	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)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\u:	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

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	2026-05-03_1009c08b46949bcba34883258cfb4607_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	klnfx.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
768	cmd.exe
2256	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
2256	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4936	rundll32.exe
4936	rundll32.exe
4936	rundll32.exe
4936	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4936	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3404	2026-05-03_1009c08b46949bcba34883258cfb4607_elex_wannacry.exe
4296	klnfx.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3404 wrote to memory of 768	3404	2026-05-03_1009c08b46949bcba34883258cfb4607_elex_wannacry.exe	79
PID 768 wrote to memory of 2256	768	cmd.exe	81
PID 768 wrote to memory of 4296	768	cmd.exe	82
PID 4296 wrote to memory of 4936	4296	klnfx.exe	83

C:\Users\Admin\AppData\Local\Temp\2026-05-03_1009c08b46949bcba34883258cfb4607_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-03_1009c08b46949bcba34883258cfb4607_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3404
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\klnfx.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-03_1009c08b46949bcba34883258cfb4607_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:768
- - 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:2256
- - \??\c:\klnfx.exe
    c:\klnfx.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-03_1009c08b46949bcba34883258cfb4607_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4296
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\wwpwv\ofzwf.dll",DoVirusScan c:\klnfx.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:4936

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

klnfx.exe

Path C:\klnfx.exe
Size 91KB
SHA256 f2da28acb9646c264bf22285a4b93df016b0cbe973c4b35f01fc0b079c2502aa
MD5 427b498ff5bfcd8324badb6b8011674d
SHA1 8dd6640df489ca41a653c1679f45f586b9d2be59
SHA512 52423a6094d32497cdf4deca0c308ca702675e83ae84d9bb2376d94e9a6078505734e458f3bdd4561f5b49d01187e5b4fd1de2ef79395678f8ae1c58d9b57bba
SSDEEP 1536:TSSABNx6vb4RoI47zzzzzzzzzvfxzVzNrzzzgzzzzzzzzzzzzzzzz6zzzdzzzzlZ:eSABNx6vb4RoI4pyjHYLhal01UoPX+ha
TLSH
T17D93CF07ABA948C9F221BC30156E3B7587BF985D7F1457979348EE4E9433D80EC3628A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

ofzwf.dll

Path C:\wwpwv\ofzwf.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/3404-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/3404-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4296-7-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4936-10-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/4936-11-0x0000000010001000-0x0000000010021000-memory.dmp

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memory/4936-12-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/4936-13-0x0000000010001000-0x0000000010021000-memory.dmp

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