farfli | ebd2f4847039022f43471bce5bd4945db99741b4d2c4b0c44cde0f3d31a3c058

General

Target
2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_coinminer_elex_wannacry.exe
Size 413KB
Sample261108-eag3caty6j
SHA256 ebd2f4847039022f43471bce5bd4945db99741b4d2c4b0c44cde0f3d31a3c058
MD5 e7435098d3abc6c7b8dd5838b9a28c20
SHA1 deb613f66d8c18bd21de8cf387ac76ade0b22a92
SHA512 98bd57fa08e1041860e6954e2178850a5c371fe6891c0791665a13484bcb67810c4cd92ee293599d9a81a7c7e79019adb1cf55153f8ceba0998d878938c49061
SSDEEP 6144:TKgGmTBBuFIsBMkVuq4nITJJVn0wOa7sNvYfSkk/F6LSc:jGmTju+mMC4ITJE8dfSJ/F6P
TLSH
T1BD94D02272D08BA3C1866432CE66E63CD3E5CC689C705E3773E9F65DEE36941423A275
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit defense_evasion 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/3460-7-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli
behavioral1/memory/3460-9-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli
behavioral1/memory/3460-11-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral1/memory/3460-7-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3460-9-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3460-11-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Custom signature

UPX dump on OEP (original entry point) 1 IoCs

resource	yara_rule
behavioral1/files/0x00070000000004e8-2.dat	UPX

Badlisted process makes network request 4 IoCs

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

flow	pid	Process
11	3460	rundll32.exe
17	3460	rundll32.exe
18	3460	rundll32.exe
33	3460	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
4800	hydrv.exe

Executes dropped EXE 1 IoCs

pid	Process
4800	hydrv.exe

Loads dropped DLL 1 IoCs

pid	Process
3460	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-1-5-21-939655444-3071939294-1401108526-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\D3D = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\kclzm\\nxuze.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)	\??\v:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\s:	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)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\r:	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 created	\??\c:\Program Files\kclzm\nxuze.dll	hydrv.exe
File opened for modification	\??\c:\Program Files\kclzm	hydrv.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
3624	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	rundll32.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_coinminer_elex_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	hydrv.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
3624	cmd.exe
3924	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
3924	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3460	rundll32.exe
3460	rundll32.exe
3460	rundll32.exe
3460	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3460	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3104	2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_coinminer_elex_wannacry.exe
4800	hydrv.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3104 wrote to memory of 3624	3104	2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_coinminer_elex_wannacry.exe	84
PID 3624 wrote to memory of 3924	3624	cmd.exe	86
PID 3624 wrote to memory of 4800	3624	cmd.exe	88
PID 4800 wrote to memory of 3460	4800	hydrv.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3104
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\hydrv.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_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:3624
- - 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:3924
- - C:\Users\Admin\AppData\Local\Temp\hydrv.exe
    C:\Users\Admin\AppData\Local\Temp\\hydrv.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_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:4800
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\kclzm\nxuze.dll",InitEngine C:\Users\Admin\AppData\Local\Temp\hydrv.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)
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3460

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

Indicator Removal

1

T1070

File Deletion

Modify Registry

Pre-OS Boot

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

2

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

hydrv.exe

Path C:\Users\Admin\AppData\Local\Temp\hydrv.exe
Size 413KB
SHA256 849dcf84b65460d357bb41cbf5cff2a7ec388eade2f1f37db90af4cab5d649c4
MD5 1847024ee84241fb3f70d1992a35f04a
SHA1 190b10bf5372d7bb5d79cab44446a02644adaa5f
SHA512 aaab8791a30ca485cc557c805edabfbbb7abd5728f45220ab0890786cd4a7eccfd9af7068fab57f68eb4f096833b29f6651d41bbe9a3aa9b6df1c4a7ed914802
SSDEEP 6144:TKgGmTBBuFIsBMkVuq4nITJJVn0wOa7sNvYfSkk/F6LSk:jGmTju+mMC4ITJE8dfSJ/F6v
TLSH
T1F894D02272D08BA3C1866432CE66E63CD3E5CC689C705E3773E9F65DEE36941423A275
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

nxuze.dll

Path \??\c:\Program Files\kclzm\nxuze.dll
Size 176KB
SHA256 38da11b8aaeca6c6564acd8ea4b00a57b76e2bc23bc646aedc83be2d67efbcb8
MD5 3f5257ac9469bfdf93bbe835106e9ba1
SHA1 deea43d6afa83da0f7a860b4f5dd273ed1efa940
SHA512 30affcea2eac67a5abec83c6b09421bc6b7b0222b3df730c33477a6afd06c3355a83ec1f916e984e7d8c4e2324c1989e0fef7f14176aaa9bf61d96ad4762d740
SSDEEP 3072:KiDJQVl82dm+NBiPAaHDb0gL/CyGbEPVMnY0RVjatbmKb6DWSFoocV:1Jv2tOItshGYdMnYYVjasKbOWSFofV
TLSH
T1A8041261862D1C30D087B3717B05920DF6B453A49079CB93F7B8AF2B3D12AEA806E353
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3460-7-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/3460-10-0x000000001005A000-0x000000001005B000-memory.dmp

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memory/3460-9-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/3460-11-0x0000000010000000-0x0000000010067000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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