farfli | a74c5912d75afe8f331dfa9614e9122b0006532ff71f03368e4c631e5b0e087c

General

Target
2026-05-31_6d26318a3f2b7523bdbd5ec13fb55d56_elex_wannacry.exe
Size 119KB
Sample260531-gr4zjsct2q
SHA256 a74c5912d75afe8f331dfa9614e9122b0006532ff71f03368e4c631e5b0e087c
MD5 6d26318a3f2b7523bdbd5ec13fb55d56
SHA1 f5d843652871452e773cdc10c8c0eee8c8e3463d
SHA512 02070cda3835db1a8ba6b6e339cb55406cea66e15f577361862e48ed2389501dc6ab9485a28e572574e34dac887ee5507f1106514515d2b660a3122204083d64
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdBO:KiAXaKDXZa/4VlCm7fE7QlEKtSNid8
TLSH
T123C39E126BF4C9A6E0661DB4177B47644A76FC6E3E1883175794A60EEC30F00EF293A4
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 1 IoCs

resource	yara_rule
behavioral2/memory/3160-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 1 IoCs

resource	yara_rule
behavioral2/memory/3160-12-0x0000000010000000-0x000000001002E000-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	3160	rundll32.exe
2	3160	rundll32.exe
3	3160	rundll32.exe
4	3160	rundll32.exe
5	3160	rundll32.exe
6	3160	rundll32.exe
7	3160	rundll32.exe
8	3160	rundll32.exe

Deletes itself 1 IoCs

pid	Process
1400	mudhqcx.exe

Executes dropped EXE 1 IoCs

pid	Process
1400	mudhqcx.exe

Loads dropped DLL 1 IoCs

pid	Process
3160	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-1-5-21-2654269261-3199571979-4291878722-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\hkcthir\\mxdvbi.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)	\??\b:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\y:	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)	\??\o:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	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)	\??\a:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	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

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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mudhqcx.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-31_6d26318a3f2b7523bdbd5ec13fb55d56_elex_wannacry.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
3444	cmd.exe
2848	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
2848	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3160	rundll32.exe
3160	rundll32.exe
3160	rundll32.exe
3160	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3160	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1708	2026-05-31_6d26318a3f2b7523bdbd5ec13fb55d56_elex_wannacry.exe
1400	mudhqcx.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1708 wrote to memory of 3444	1708	2026-05-31_6d26318a3f2b7523bdbd5ec13fb55d56_elex_wannacry.exe	81
PID 3444 wrote to memory of 2848	3444	cmd.exe	83
PID 3444 wrote to memory of 1400	3444	cmd.exe	84
PID 1400 wrote to memory of 3160	1400	mudhqcx.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-31_6d26318a3f2b7523bdbd5ec13fb55d56_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-31_6d26318a3f2b7523bdbd5ec13fb55d56_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1708
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\mudhqcx.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-31_6d26318a3f2b7523bdbd5ec13fb55d56_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3444
- - 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:2848
- - \??\c:\mudhqcx.exe
    c:\mudhqcx.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-31_6d26318a3f2b7523bdbd5ec13fb55d56_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1400
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\hkcthir\mxdvbi.dll",GetWindowClass c:\mudhqcx.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:3160

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

mudhqcx.exe

Path C:\mudhqcx.exe
Size 119KB
SHA256 0e5b0deca9177b33e1bb301e1052d1e953ecd9a77a77c62cbecf2dbeb7471e1b
MD5 791b7dbe14e86d5c72659400edd851f7
SHA1 4302056b9887c0d4088422e5310f9b85990e5458
SHA512 ac1e7da5b16b64be2a50bff022adfe18846a4f276de3723980a9013d5593ba71f4b1883c3863f7e0b8dda30e257536eda453af2013cdbbf27047d47de0095aa1
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdBn:KiAXaKDXZa/4VlCm7fE7QlEKtSNidh
TLSH
T1E3C39E126BF4C9A6E0661DB4177B47644A76FC6E3E1883175794A70EEC30F00EF293A4
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

mxdvbi.dll

Path \??\c:\hkcthir\mxdvbi.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

memory/1400-6-0x0000000000400000-0x000000000041B000-memory.dmp

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memory/1400-8-0x0000000000400000-0x000000000041B000-memory.dmp

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memory/1708-0-0x0000000000400000-0x000000000041B000-memory.dmp

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memory/1708-2-0x0000000000400000-0x000000000041B000-memory.dmp

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memory/3160-11-0x0000000010000000-0x000000001002E000-memory.dmp

Download

memory/3160-12-0x0000000010000000-0x000000001002E000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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