farfli | 30ec07db6374136481ee1d2218a20e657353ee8291f393388c5d16bccf324074

General

Target
2026-07-27_76aead12f4d0105e834545d27267b73f_elex_feodo_wannacry.exe
Size 92KB
Sample260727-tzdhsaxvht
SHA256 30ec07db6374136481ee1d2218a20e657353ee8291f393388c5d16bccf324074
MD5 76aead12f4d0105e834545d27267b73f
SHA1 f4ada67d6a78f8dc1e9c825cfe5931b53bc7ac50
SHA512 e63a97211ffd28a68f85c1c678b3814ad11a5ffd4ed0c03b80f993cf9f445a0211b7662c7795759d8d5370ea69f2b402604e112b63888804162d95e556e6cc76
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdR:KiAXaKDXZa/4VlCm7fE7QlEKtSNidR
TLSH
T1B693AE126BF4CD62E0A549B5177707A54E77BC7A2D24C70B9BA0BA1E9C30F40EF24369
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 1 IoCs

resource	yara_rule
behavioral2/memory/4384-10-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 1 IoCs

resource	yara_rule
behavioral2/memory/4384-10-0x0000000010000000-0x000000001002E000-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
1	4384	rundll32.exe
2	4384	rundll32.exe
3	4384	rundll32.exe
4	4384	rundll32.exe
5	4384	rundll32.exe
6	4384	rundll32.exe
7	4384	rundll32.exe
8	4384	rundll32.exe

Deletes itself 1 IoCs

pid	Process
872	kfjck.exe

Executes dropped EXE 1 IoCs

pid	Process
872	kfjck.exe

Loads dropped DLL 1 IoCs

pid	Process
4384	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-1-5-21-1079202589-886135813-2527035092-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\hfuxwfwgx\\muwsemim.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)	\??\g:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
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)	\??\k:	rundll32.exe
File opened (read-only)	\??\v:	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
5964	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	2026-07-27_76aead12f4d0105e834545d27267b73f_elex_feodo_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	kfjck.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
5964	cmd.exe
1268	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1268	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4384	rundll32.exe
4384	rundll32.exe
4384	rundll32.exe
4384	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4384	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2324	2026-07-27_76aead12f4d0105e834545d27267b73f_elex_feodo_wannacry.exe
872	kfjck.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2324 wrote to memory of 5964	2324	2026-07-27_76aead12f4d0105e834545d27267b73f_elex_feodo_wannacry.exe	89
PID 5964 wrote to memory of 1268	5964	cmd.exe	91
PID 5964 wrote to memory of 872	5964	cmd.exe	92
PID 872 wrote to memory of 4384	872	kfjck.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-27_76aead12f4d0105e834545d27267b73f_elex_feodo_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_76aead12f4d0105e834545d27267b73f_elex_feodo_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2324
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\kfjck.exe "C:\Users\Admin\AppData\Local\Temp\2026-07-27_76aead12f4d0105e834545d27267b73f_elex_feodo_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:5964
- - 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:1268
- - \??\c:\kfjck.exe
    c:\kfjck.exe "C:\Users\Admin\AppData\Local\Temp\2026-07-27_76aead12f4d0105e834545d27267b73f_elex_feodo_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:872
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\hfuxwfwgx\muwsemim.dll",GetWindowClass c:\kfjck.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:4384

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

muwsemim.dll

Path \??\c:\hfuxwfwgx\muwsemim.dll
Size 46KB
SHA256 615e79da4fd5512e796a7aa7335791445c4419564a62065b96ec6af4f45c5da0
MD5 e1b69009b84a57990f394d671390ed02
SHA1 586cb5213c9cbdfe5ce94a284c324d917cc52903
SHA512 c78b9484fa33cf5379257ab965d56b229d696fe262367a180bf7b50691b0c51e5a07dc7b96be07cf977ea0aab9ce29c503c4f36c4009ec480e2fb0498ffc13bc
SSDEEP 768:KsUfnvxs6iLlhpfFPtnQf7kifD/v7yb9BEtoyviA1129Vvi3UTP:KsJT1qf4W/vub9yNiA118d+kP
TLSH
T17823F2A947B44EB3E2BD0779889187DC69BD6D26173384054A6301DF7C70443EA6C6EE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

kfjck.exe

Path \??\c:\kfjck.exe
Size 92KB
SHA256 a023380ecb965d2a37b823f18f33114411a5fb1d0d0d92efd868cfaea83211c8
MD5 96b17734c4643c628648bacb19147891
SHA1 9d115f8a77daafd708fc49df6f2226c89b493929
SHA512 24b92eb8e4bebec8e37a7f5a6de64edc7bbed6fa4534d2bd2ddf945f310ed59e00edeb2a5d37507acf7ed7d7c8e5d7eabc5fc73444cd2dd35006600a82b7c015
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdRu:KiAXaKDXZa/4VlCm7fE7QlEKtSNidRu
TLSH
T11B93AE026BF4CD62E0A549B5177707A54E77BC7A2D24C70B5BA0BA1E9C30F40EF24369
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/872-6-0x0000000000400000-0x000000000041B000-memory.dmp

Download

memory/2324-0-0x0000000000400000-0x000000000041B000-memory.dmp

Download

memory/2324-2-0x0000000000400000-0x000000000041B000-memory.dmp

Download

memory/4384-9-0x0000000010000000-0x000000001002E000-memory.dmp

Download

memory/4384-10-0x0000000010000000-0x000000001002E000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads