farfli | cf2621f903875859aecb042d05a841c020f44ba3a01eb977fce12eb5b25bab85

General

Target
2026-08-03_8f860dfd40235a3fb75a7b3d48a5aa9c_coinminer_elex_wannacry.exe
Size 415KB
Sample260803-flea9sstat
SHA256 cf2621f903875859aecb042d05a841c020f44ba3a01eb977fce12eb5b25bab85
MD5 8f860dfd40235a3fb75a7b3d48a5aa9c
SHA1 c9637623d01e13b9afa864e759bcff1ff4e83003
SHA512 48008dcfc14da2bb6e26210a64bd484840b72db139923928f4ecb583045d17e9cdf03eeff428aa1e1667096e68ef58b0479b427165d231b2be82b72b512edffd
SSDEEP 6144:TKgGmTBBuFIsBMkVuq4nITJJVn0wOa7sNvYfSkk/F6L:jGmTju+mMC4ITJE8dfSJ/F6
TLSH
T18594D02272D0CBA3C0856432CE66E63CD3E5CC689D705E3773E9FA5DEA36941423A275
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 3 IoCs

resource	yara_rule
behavioral1/memory/4156-7-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli
behavioral1/memory/4156-9-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli
behavioral1/memory/4156-11-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral1/memory/4156-7-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4156-9-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4156-11-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 1 IoCs

resource	yara_rule
behavioral1/files/0x000b0000000243a2-2.dat	UPX

Badlisted process makes network request 4 IoCs

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

flow	pid	Process
5	4156	rundll32.exe
15	4156	rundll32.exe
14	4156	rundll32.exe
40	4156	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4552	ntemj.exe

Executes dropped EXE 1 IoCs

pid	Process
4552	ntemj.exe

Loads dropped DLL 1 IoCs

pid	Process
4156	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-1-5-21-876885714-46325919-1482798410-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\D3D = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\bvtrg\\lfwnjjev.dll\",InitEngine"	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)	\??\g:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\s:	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

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\bvtrg	ntemj.exe
File created	\??\c:\Program Files\bvtrg\lfwnjjev.dll	ntemj.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
1760	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ntemj.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-03_8f860dfd40235a3fb75a7b3d48a5aa9c_coinminer_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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
3912	PING.EXE
1760	cmd.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
3912	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4156	rundll32.exe
4156	rundll32.exe
4156	rundll32.exe
4156	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4156	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4888	2026-08-03_8f860dfd40235a3fb75a7b3d48a5aa9c_coinminer_elex_wannacry.exe
4552	ntemj.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4888 wrote to memory of 1760	4888	2026-08-03_8f860dfd40235a3fb75a7b3d48a5aa9c_coinminer_elex_wannacry.exe	86
PID 1760 wrote to memory of 3912	1760	cmd.exe	88
PID 1760 wrote to memory of 4552	1760	cmd.exe	89
PID 4552 wrote to memory of 4156	4552	ntemj.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-08-03_8f860dfd40235a3fb75a7b3d48a5aa9c_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_8f860dfd40235a3fb75a7b3d48a5aa9c_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4888
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\ntemj.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-03_8f860dfd40235a3fb75a7b3d48a5aa9c_coinminer_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:1760
- - 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:3912
- - C:\Users\Admin\AppData\Local\Temp\ntemj.exe
    C:\Users\Admin\AppData\Local\Temp\\ntemj.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-03_8f860dfd40235a3fb75a7b3d48a5aa9c_coinminer_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4552
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\bvtrg\lfwnjjev.dll",InitEngine C:\Users\Admin\AppData\Local\Temp\ntemj.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:4156

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

ntemj.exe

Path C:\Users\Admin\AppData\Local\Temp\ntemj.exe
Size 415KB
SHA256 eb39d502cf3be9d1af79c5849a333819089850b1216a1aa506affe3cef39aad0
MD5 708c4af69b53e5c8febc8f42f7938ae6
SHA1 11276e5b280b1611b842ad849736adc4c9f710f9
SHA512 3ec7c0ffb29caf5b955ad55eed0454c5673fe2b9d7f5d8e88e0a1705c7d9262b26767e9271c1811baf1e56911273cd72654ce3774a4b6c442263309dd00cb6a4
SSDEEP 6144:TKgGmTBBuFIsBMkVuq4nITJJVn0wOa7sNvYfSkk/F6L:jGmTju+mMC4ITJE8dfSJ/F6
TLSH
T16B94D02272D0CBA3C0856432CE66E63CD3E5CC689D705E3773E9FA5DEA36941423A275
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

lfwnjjev.dll

Path \??\c:\Program Files\bvtrg\lfwnjjev.dll
Size 176KB
SHA256 245a2bfdae5d35b30dd130ea7f811c8efce4c7c5a5cfc24bf768fd8fef079e44
MD5 7416751532edd47dc6b2def7400f7a27
SHA1 438d21c7ac161fee1945668e892fcf868b5f070f
SHA512 e959780ee0063f788574ea59ce3ee101ee283e9fee87f8f7df1415a4653e9a91623c73930d10a203138c047552afdfe8e247feb714286db8da23746ce05f8cdf
SSDEEP 3072:KiDJQVl82dm+NBiPAaHDb0gL/CyGbEPVMnY0RVjatbmKb6DWSFooc9:1Jv2tOItshGYdMnYYVjasKbOWSFof9
TLSH
T1ED041261862D1C34D087B7717B05920DF6B452A49179CBD3F7B8AF2B3D12AEA806E353
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4156-7-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/4156-10-0x000000001005A000-0x000000001005B000-memory.dmp

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memory/4156-9-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/4156-11-0x0000000010000000-0x0000000010067000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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