farfli | 8c2b28b165fb8b00c6fc946049a576b9119c079d915ff596da95886d83b264f8

Analysis

max time kernel
148s
max time network
137s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
19/08/2026, 00:05

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General

Target
2026-08-18_1e16f147b7b6f1f384cc56674d525e47_elex_feodo_wannacry.exe
Size 93KB
Sample260819-adbyaavvbz
SHA256 8c2b28b165fb8b00c6fc946049a576b9119c079d915ff596da95886d83b264f8
MD5 1e16f147b7b6f1f384cc56674d525e47
SHA1 93734f4dd269d35bdfc0eae31779cb9f980d7c3e
SHA512 5e33e3be47515af5c3c0c337a9abbb854408b1cef76cadbba04c62ac260f59cc178ca54d178cc7b9eb30ba4af6a4c963f84ffedaaeaff0abf448ce3fbfb05c6a
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdRL:KiAXaKDXZa/4VlCm7fE7QlEKtSNidRL
TLSH
T1B093AE126BF4CD62E0A549B51B7707A54E77BC7A2D24C30B5BA0BA1E9C34F40EF24369
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 4 IoCs

resource	yara_rule
behavioral2/memory/3300-9-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/3300-10-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli
behavioral2/memory/3300-11-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/3300-12-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/3300-9-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3300-11-0x0000000010000000-0x000000001002E000-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
3	3300	rundll32.exe
6	3300	rundll32.exe
7	3300	rundll32.exe
8	3300	rundll32.exe
13	3300	rundll32.exe
14	3300	rundll32.exe
15	3300	rundll32.exe
17	3300	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4888	kxlkr.exe

Executes dropped EXE 1 IoCs

pid	Process
4888	kxlkr.exe

Loads dropped DLL 1 IoCs

pid	Process
3300	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-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\dfwto\\unmhalxmo.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)	\??\a:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\h:	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)	\??\u:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\j:	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)	\??\r:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\t:	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
2172	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	2026-08-18_1e16f147b7b6f1f384cc56674d525e47_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	kxlkr.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
2172	cmd.exe
4884	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
4884	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3300	rundll32.exe
3300	rundll32.exe
3300	rundll32.exe
3300	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3300	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
880	2026-08-18_1e16f147b7b6f1f384cc56674d525e47_elex_feodo_wannacry.exe
4888	kxlkr.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 880 wrote to memory of 2172	880	2026-08-18_1e16f147b7b6f1f384cc56674d525e47_elex_feodo_wannacry.exe	89
PID 2172 wrote to memory of 4884	2172	cmd.exe	91
PID 2172 wrote to memory of 4888	2172	cmd.exe	92
PID 4888 wrote to memory of 3300	4888	kxlkr.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-18_1e16f147b7b6f1f384cc56674d525e47_elex_feodo_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_1e16f147b7b6f1f384cc56674d525e47_elex_feodo_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:880
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\kxlkr.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-18_1e16f147b7b6f1f384cc56674d525e47_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:2172
- - 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:4884
- - \??\c:\kxlkr.exe
    c:\kxlkr.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-18_1e16f147b7b6f1f384cc56674d525e47_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:4888
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\dfwto\unmhalxmo.dll",GetWindowClass c:\kxlkr.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:3300

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

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

unmhalxmo.dll

Path \??\c:\dfwto\unmhalxmo.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

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kxlkr.exe

Path \??\c:\kxlkr.exe
Size 93KB
SHA256 98b429c68e83bbb87a3f5c5cc457b41a6c38bd2ca46859909afcd0b0080997b6
MD5 4f1f7c95c4a7f08ae2ecbc45f462fc52
SHA1 f475f4e3b13ba0c6d74b79528775ea64415cadfa
SHA512 c8078d830123f7800ad72e9a9d49cb7b0fa872f018f4e58221afff926b7ad8bac37852fe45d07a4dd9a7775e71d601353513e739bfd9c590a54d964be860f6ff
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdRI:KiAXaKDXZa/4VlCm7fE7QlEKtSNidRI
TLSH
T13D93AE126BF4CD62E0A549B5177707A54E77BC7A2D24C31B5BA0BA1E9C30F40EF28369
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/880-0-0x0000000000400000-0x000000000041B000-memory.dmp

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memory/880-2-0x0000000000400000-0x000000000041B000-memory.dmp

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memory/3300-9-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/3300-10-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/3300-11-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/3300-12-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/4888-6-0x0000000000400000-0x000000000041B000-memory.dmp

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