farfli | d61ea31aab31e7d2e2eff2f56bd77a86515de82c1d10ecd6296baf1dd2be3a07

Analysis

max time kernel
148s
max time network
150s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
03/10/2026, 11:15

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General

Target
2026-10-02_64ecc7dfb927f4348afbfe14c994dfb6_elex_wannacry.exe
Size 89KB
Sample261003-nc3lhaxbpc
SHA256 d61ea31aab31e7d2e2eff2f56bd77a86515de82c1d10ecd6296baf1dd2be3a07
MD5 64ecc7dfb927f4348afbfe14c994dfb6
SHA1 9066e2e4cdbc54802c72fba6364b4adbec0f9329
SHA512 34b21ee52990d9591ecc66ae19a0d4fdc14fff05e01806a0e04ef6b49803faab0b4bd290875b2cc46e22700f0d58e144d358d86669003735f91284f93c96cd70
SSDEEP 1536:TSSABNx6vb4RoI47zzzzzzzzzvfxzVzNrzzzgzzzzzzzzzzzzzzzz6zzzdzzzzlT:eSABNx6vb4RoI4pyjHYLhal01UoPX+hg
TLSH
T1BC93CF076BA948C9F221BC30552E3B7587BFA85D7F1457979348EE4D9837C80EC3628A
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/2036-9-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli
behavioral2/memory/2036-10-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/2036-11-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli
behavioral2/memory/2036-12-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/2036-9-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2036-11-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 3 IoCs

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

flow	pid	Process
7	2036	rundll32.exe
8	2036	rundll32.exe
10	2036	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000d00000001c626-7.dat	acprotect

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
5332	mrnjh.exe

Executes dropped EXE 1 IoCs

pid	Process
5332	mrnjh.exe

Loads dropped DLL 1 IoCs

pid	Process
2036	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:\\vrbhouevn\\fkobmuno.dll\",DoVirusScan"	rundll32.exe

Enumerates connected drives 3 TTPs 24 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)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
	\??\f:\	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\w:	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
4112	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	mrnjh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-02_64ecc7dfb927f4348afbfe14c994dfb6_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
4112	cmd.exe
4860	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
4860	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2036	rundll32.exe
2036	rundll32.exe
2036	rundll32.exe
2036	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2036	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4688	2026-10-02_64ecc7dfb927f4348afbfe14c994dfb6_elex_wannacry.exe
5332	mrnjh.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4688 wrote to memory of 4112	4688	2026-10-02_64ecc7dfb927f4348afbfe14c994dfb6_elex_wannacry.exe	90
PID 4112 wrote to memory of 4860	4112	cmd.exe	92
PID 4112 wrote to memory of 5332	4112	cmd.exe	93
PID 5332 wrote to memory of 2036	5332	mrnjh.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-02_64ecc7dfb927f4348afbfe14c994dfb6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-02_64ecc7dfb927f4348afbfe14c994dfb6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4688
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\mrnjh.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-02_64ecc7dfb927f4348afbfe14c994dfb6_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:4112
- - 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:4860
- - \??\c:\mrnjh.exe
    c:\mrnjh.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-02_64ecc7dfb927f4348afbfe14c994dfb6_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5332
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\vrbhouevn\fkobmuno.dll",DoVirusScan c:\mrnjh.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:2036

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

Replay Monitor

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Downloads

mrnjh.exe

Path \??\c:\mrnjh.exe
Size 89KB
SHA256 f6ae055ca63c6b8331d0810627cfa3db66d613ff28dcfe6136ee6ae2a444f630
MD5 1849be6b09b515acd8c5d9398231bad6
SHA1 c46d71540170d6fe71adf498fe102e5efbe27c98
SHA512 f6dd860774a644157d9b632541226c5b3a96dd564a15e4046c51119a395cccba2afcccfbcfd52c058c2f7a8c4b72ed2f0652639eed54d9d25a121352dea5e3e1
SSDEEP 1536:TSSABNx6vb4RoI47zzzzzzzzzvfxzVzNrzzzgzzzzzzzzzzzzzzzz6zzzdzzzzlH:eSABNx6vb4RoI4pyjHYLhal01UoPX+h2
TLSH
T1B793CF076BA948C9F221BD30556E3B3187BF985D7F1457979348EE4E9833C80EC3628A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

fkobmuno.dll

Path \??\c:\vrbhouevn\fkobmuno.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/2036-9-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/2036-10-0x0000000010001000-0x0000000010021000-memory.dmp

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memory/2036-11-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/2036-12-0x0000000010001000-0x0000000010021000-memory.dmp

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memory/4688-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4688-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/5332-6-0x0000000000400000-0x0000000000417000-memory.dmp

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