farfli | ad4952d4af73ee8d5daff0d951d03e32fe061684b99d1792d23652135797e855

General

Target
2026-09-07_3cf72fc857bc4071a0d8d37f0004b257_elex_wannacry.exe
Size 94KB
Sample260909-dvgrmsag43
SHA256 ad4952d4af73ee8d5daff0d951d03e32fe061684b99d1792d23652135797e855
MD5 3cf72fc857bc4071a0d8d37f0004b257
SHA1 e54f23cb1348571e37c2415044dd10ae8a7e5a3f
SHA512 f739bc870ac643f0601a506e1da1047cd759b9fee05796189bca365dec2217b99ea31c1b42a212af52b0f9c14736c7d2c84e8b7254ca6380ccb81316e748eda4
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdRl:KiAXaKDXZa/4VlCm7fE7QlEKtSNidRl
TLSH
T10B93AE126BF4CD62E0A549B51B7707A54E77BC7A2D24C30B5BA0BA1E9C34F40EF24369
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/928-10-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 1 IoCs

resource	yara_rule
behavioral2/memory/928-10-0x0000000010000000-0x000000001002E000-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
5	928	rundll32.exe
10	928	rundll32.exe
11	928	rundll32.exe
12	928	rundll32.exe
14	928	rundll32.exe
15	928	rundll32.exe
16	928	rundll32.exe
17	928	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3188	zuaca.exe

Executes dropped EXE 1 IoCs

pid	Process
3188	zuaca.exe

Loads dropped DLL 1 IoCs

pid	Process
928	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-1-5-21-2115213192-531537726-3295841909-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\vxtgn\\ntwklsk.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)	\??\q:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\m:	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)	\??\u:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\d:	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)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\n:	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
5268	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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	zuaca.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-07_3cf72fc857bc4071a0d8d37f0004b257_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
5268	cmd.exe
1808	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
1808	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
928	rundll32.exe
928	rundll32.exe
928	rundll32.exe
928	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	928	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5324	2026-09-07_3cf72fc857bc4071a0d8d37f0004b257_elex_wannacry.exe
3188	zuaca.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5324 wrote to memory of 5268	5324	2026-09-07_3cf72fc857bc4071a0d8d37f0004b257_elex_wannacry.exe	88
PID 5268 wrote to memory of 1808	5268	cmd.exe	90
PID 5268 wrote to memory of 3188	5268	cmd.exe	91
PID 3188 wrote to memory of 928	3188	zuaca.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-09-07_3cf72fc857bc4071a0d8d37f0004b257_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-07_3cf72fc857bc4071a0d8d37f0004b257_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5324
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\zuaca.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-07_3cf72fc857bc4071a0d8d37f0004b257_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:5268
- - 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:1808
- - \??\c:\zuaca.exe
    c:\zuaca.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-07_3cf72fc857bc4071a0d8d37f0004b257_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3188
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\vxtgn\ntwklsk.dll",GetWindowClass c:\zuaca.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:928

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

ntwklsk.dll

Path \??\c:\vxtgn\ntwklsk.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

zuaca.exe

Path \??\c:\zuaca.exe
Size 94KB
SHA256 3e33d0cfccf55f346fbac15cf6e6a2aab9f36871bcbb884f068ade4f8098518d
MD5 2878a3a49794bccbc457cf9eaed54bab
SHA1 d9ea05654ea78b6097779eab6b3275da9ad185c4
SHA512 c6253fb11cba67e5809bffce53e075d6882544d2c0fbdc97727b89806e1639ee5560e5b1da1a6b403cda923345adcd54d1c06ec0cb566e3e8414fe6880523e62
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdRI:KiAXaKDXZa/4VlCm7fE7QlEKtSNidRI
TLSH
T16C93AE126BF4CD62E0A549B5177707A54E77BC7A2D24C30B5BA0BA1E9C34F40EF24369
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/928-9-0x0000000010000000-0x000000001002E000-memory.dmp

Download

memory/928-10-0x0000000010000000-0x000000001002E000-memory.dmp

Download

memory/3188-6-0x0000000000400000-0x000000000041B000-memory.dmp

Download

memory/5324-0-0x0000000000400000-0x000000000041B000-memory.dmp

Download

memory/5324-2-0x0000000000400000-0x000000000041B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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