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 2 IoCs

resource	yara_rule
behavioral2/memory/4588-8-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli
behavioral2/memory/4588-10-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4588-8-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4588-10-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Custom signature

UPX dump on OEP (original entry point) 1 IoCs

resource	yara_rule
behavioral2/files/0x000600000001b85a-1.dat	UPX

Badlisted process makes network request 4 IoCs

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

flow	pid	Process
9	4588	rundll32.exe
10	4588	rundll32.exe
11	4588	rundll32.exe
12	4588	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
4936	rgcdtxu.exe

Executes dropped EXE 1 IoCs

pid	Process
4936	rgcdtxu.exe

Loads dropped DLL 1 IoCs

pid	Process
4588	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-1-5-21-461973139-3212354679-1508698038-1000\Software\Microsoft\Windows\CurrentVersion\Run\D3D = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\vtuumjofb\\lfweq.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)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\g:	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)	\??\t:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\a:	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\vtuumjofb\lfweq.dll	rgcdtxu.exe
File opened for modification	\??\c:\Program Files\vtuumjofb	rgcdtxu.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
1084	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	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	rgcdtxu.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
1084	cmd.exe
4528	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
4528	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4588	rundll32.exe
4588	rundll32.exe
4588	rundll32.exe
4588	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4588	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5564	2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_coinminer_elex_wannacry.exe
4936	rgcdtxu.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5564 wrote to memory of 1084	5564	2026-11-07_e7435098d3abc6c7b8dd5838b9a28c20_coinminer_elex_wannacry.exe	88
PID 1084 wrote to memory of 4528	1084	cmd.exe	90
PID 1084 wrote to memory of 4936	1084	cmd.exe	91
PID 4936 wrote to memory of 4588	4936	rgcdtxu.exe	92

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:5564
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\rgcdtxu.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:1084
- - 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:4528
- - C:\Users\Admin\AppData\Local\Temp\rgcdtxu.exe
    C:\Users\Admin\AppData\Local\Temp\\rgcdtxu.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:4936
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\vtuumjofb\lfweq.dll",InitEngine C:\Users\Admin\AppData\Local\Temp\rgcdtxu.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:4588

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

rgcdtxu.exe

Path C:\Users\Admin\AppData\Local\Temp\rgcdtxu.exe
Size 413KB
SHA256 33979ed7505112b1ec8914f190acaccbf7501a2aa38faadec307b11cee0f78a9
MD5 ced57dbe1a3cfa6af7db1bd519bf1e1b
SHA1 fed18d40e52c59591f0c5ceb52b95dd9b985a17c
SHA512 bfcf95846eb3517b693f2551f68a7da68aea7afc27709c11802963877704891276662cc80a86b0853f38fe4d18ebaa9ea7c6ff8efd91e5ad9fb593afc17dd783
SSDEEP 6144:TKgGmTBBuFIsBMkVuq4nITJJVn0wOa7sNvYfSkk/F6LSz:jGmTju+mMC4ITJE8dfSJ/F66
TLSH
T17994D02272D0CBA3C1866432CE66E63CD3E5CC689C705E3773E9F65DEA36941423A275
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

lfweq.dll

Path \??\c:\Program Files\vtuumjofb\lfweq.dll
Size 176KB
SHA256 e831509d8f2661756b5bd3a8c980b82e5f2a56e16f4446400478e57e270b7051
MD5 8d476de5a302aba56e360756fe2fa4f7
SHA1 4a65621e254572cf67d9c3b2270776bb1ec36c1a
SHA512 abe6d92cff9064c71b2294e46a2b59102b688f77ec711d5e681430e288cff4ecdbcc00116adea39ad72b8844c3b55ee4cb30da6c28c9b3ff685e438ee0e39d43
SSDEEP 3072:KiDJQVl82dm+NBiPAaHDb0gL/CyGbEPVMnY0RVjatbmKb6DWSFoocp:1Jv2tOItshGYdMnYYVjasKbOWSFofp
TLSH
T181041261862D1C34D087B7717B05920DF6B452A49179CB93F7B8AF2B3D12AEA805E353
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4588-6-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/4588-7-0x000000001005A000-0x000000001005B000-memory.dmp

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memory/4588-8-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/4588-10-0x0000000010000000-0x0000000010067000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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