farfli | f4027bd24e2cd150fb05a9adec9e89b52441b68eacb29748ca5113fa03f8f958

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
08/08/2026, 05:04

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General

Target
2026-08-08_284b017b7c5edf1685d8bdd7e24abf99_coinminer_elex_wannacry.exe
Size 312KB
Sample260808-fp8z2styfs
SHA256 f4027bd24e2cd150fb05a9adec9e89b52441b68eacb29748ca5113fa03f8f958
MD5 284b017b7c5edf1685d8bdd7e24abf99
SHA1 23cabb3f45617095976b97d637877c185777dce9
SHA512 aa433aa14f128ba32a41b1cf1b1d3aaf8d83ab273c1562374b49cd1302804ae651d3ef6f57882b4dba8e9ca8e267b08b819c59f74935c06e58269ce042b99817
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrO1:ywLcCmuErglr73aAD+Q
TLSH
T16464F142D511CF47FC2FCAB5823E1E355317AE553B2056A3D3C8BA1F65B2B42A63A0D8
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery execution farfli persistence spyware stealer upx

Malware Config

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli

Detects Farfli Backdoor 7 IoCs

resource	yara_rule
behavioral1/memory/4920-12-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral1/memory/4920-14-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral1/memory/4920-16-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral1/memory/4920-18-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral1/memory/4920-19-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral1/memory/4920-20-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral1/memory/4920-21-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 7 IoCs

resource	yara_rule
behavioral1/memory/4920-12-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4920-14-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4920-16-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4920-18-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4920-19-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4920-20-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4920-21-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral1/memory/4664-0-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral1/memory/4664-2-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral1/files/0x00080000000216bb-4.dat	UPX
behavioral1/memory/464-7-0x0000000000400000-0x0000000000483000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
5	4920	rundll32.exe
10	4920	rundll32.exe
11	4920	rundll32.exe
12	4920	rundll32.exe
32	4920	rundll32.exe
34	4920	rundll32.exe
45	4920	rundll32.exe
52	4920	rundll32.exe

Deletes itself 1 IoCs

pid	Process
464	cwrnq.exe

Executes dropped EXE 1 IoCs

pid	Process
464	cwrnq.exe

Loads dropped DLL 1 IoCs

pid	Process
4920	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-1-5-21-3053180483-1881419501-3594244048-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Wetor = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\clrfb\\yfvskhk.dll\",GetProc"	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)	\??\j:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\e:	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

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/4664-0-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral1/memory/4664-2-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral1/files/0x00080000000216bb-4.dat	upx
behavioral1/memory/464-7-0x0000000000400000-0x0000000000483000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\clrfb	cwrnq.exe
File created	\??\c:\Program Files\clrfb\yfvskhk.dll	cwrnq.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
5036	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	2026-08-08_284b017b7c5edf1685d8bdd7e24abf99_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	cwrnq.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
5076	PING.EXE
5036	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
5076	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4920	rundll32.exe
4920	rundll32.exe
4920	rundll32.exe
4920	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4920	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4664	2026-08-08_284b017b7c5edf1685d8bdd7e24abf99_coinminer_elex_wannacry.exe
464	cwrnq.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4664 wrote to memory of 5036	4664	2026-08-08_284b017b7c5edf1685d8bdd7e24abf99_coinminer_elex_wannacry.exe	86
PID 5036 wrote to memory of 5076	5036	cmd.exe	88
PID 5036 wrote to memory of 464	5036	cmd.exe	89
PID 464 wrote to memory of 4920	464	cwrnq.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-08-08_284b017b7c5edf1685d8bdd7e24abf99_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_284b017b7c5edf1685d8bdd7e24abf99_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4664
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\cwrnq.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-08_284b017b7c5edf1685d8bdd7e24abf99_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:5036
- - 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:5076
- - C:\Users\Admin\AppData\Local\Temp\cwrnq.exe
    C:\Users\Admin\AppData\Local\Temp\\cwrnq.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-08_284b017b7c5edf1685d8bdd7e24abf99_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:464
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\clrfb\yfvskhk.dll",GetProc C:\Users\Admin\AppData\Local\Temp\cwrnq.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:4920

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

cwrnq.exe

Path C:\Users\Admin\AppData\Local\Temp\cwrnq.exe
Size 312KB
SHA256 8cf920ce5aad3f0ab3e9085e665cd8b9fa2518776f44f38845a7e36de3df9daf
MD5 fc4dd52d9e798e5fc01fd155a5c5ff58
SHA1 e26bfa53bdf677da2c6096a10736fa2db9ef8679
SHA512 5d663fecb69bb3f8477b12ab3b87f3b937df3db48069f8ab9d890fc1a8dc3e2eaa265d6b1f77457042f084ed4d3b00e8e5749ee39dd74b32f83b613e5a656f9c
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrOc:ywLcCmuErglr73aAD+5
TLSH
T17A64F141D511CF47FC2FCAB5823E0E355317AE153B205663D3C8BA1FA5B2B52A63A0E8
MD5 SHA1 SHA512 SSDEEP TLSH

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yfvskhk.dll

Path \??\c:\Program Files\clrfb\yfvskhk.dll
Size 218KB
SHA256 013ee19812e3bc85d69ec2530e46eb7a260eca13f27255fedfdaaf3d65c13529
MD5 0b3ec301eac9470196384e80319af6e3
SHA1 c07ba34a75595fca4677536e2b998ffcd3194864
SHA512 de49759c6b02b5aa17c2ee52d7b6c49dc30bb1c711e8b45de5c90a4880bb2f6ee0df14b9e53fbfbcd209cf98667d917615acbf55df8b51ea03140959cd9004c8
SSDEEP 6144:KORxNwD2VOidhzeXwddDzLi5vOQEqscr0ZTJauytq:pnNwDTi3swddDiROXIM
TLSH
T1A424128BCF983873C5223379597951A0B9725290AFA1530DD2E6D34FA072BA2CF7B531
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/464-7-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/4664-0-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/4664-2-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/4920-13-0x00000000006D0000-0x00000000006D1000-memory.dmp

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memory/4920-10-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4920-12-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4920-14-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4920-16-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4920-18-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4920-19-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4920-20-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4920-21-0x0000000010000000-0x0000000010058000-memory.dmp

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