farfli | 7c992090d45fedb29939e22452163ff886ab5b4644d1c3ce585946ee3d9b8be2

General

Target
2026-11-07_01863f1ad94264bd77e12d5ba25b5ce6_coinminer_elex_strictor_wannacry.exe
Size 207KB
Sample261109-rhfkpsyt5j
SHA256 7c992090d45fedb29939e22452163ff886ab5b4644d1c3ce585946ee3d9b8be2
MD5 01863f1ad94264bd77e12d5ba25b5ce6
SHA1 ebac9e0f5b18734f09eb8bc3766481bbd9567166
SHA512 73b1d7c4ed90933bbe481474519f1ef45fdd39b851c20c3dd4430766cafdca0a5b65119e0b0ee66d0cf0310751fb7650a9bd4c4b079dc36a352112f8878b9e2b
SSDEEP 1536:BJaacz5htqkUla/NGVcJ/gAqcX0JMseuiGSeNVvDi0tMuUJJny3GM+9o:WaQqc9rqzMseNoVv9EJFnM8o
TLSH
T1B124480277E6C558F1B30B34DA3646F04ABBBC69EA70924F16407E5E7E32A41AD21737
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit defense_evasion 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 1 IoCs

resource	yara_rule
behavioral2/memory/4552-10-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 1 IoCs

resource	yara_rule
behavioral2/memory/4552-10-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Custom signature

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/3236-0-0x0000000000400000-0x0000000000433000-memory.dmp	UPX
behavioral2/memory/3236-2-0x0000000000400000-0x0000000000433000-memory.dmp	UPX
behavioral2/files/0x000700000001b85a-3.dat	UPX
behavioral2/memory/716-6-0x0000000000400000-0x0000000000433000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
8	4552	rundll32.exe
10	4552	rundll32.exe
11	4552	rundll32.exe
12	4552	rundll32.exe
13	4552	rundll32.exe
14	4552	rundll32.exe
17	4552	rundll32.exe
18	4552	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
716	chexzohu.exe

Executes dropped EXE 1 IoCs

pid	Process
716	chexzohu.exe

Loads dropped DLL 1 IoCs

pid	Process
4552	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\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\yckdlxg\\osqkz.dll\",init"	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)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\d:	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)	\??\i:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\m:	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
behavioral2/memory/3236-0-0x0000000000400000-0x0000000000433000-memory.dmp	upx
behavioral2/memory/3236-2-0x0000000000400000-0x0000000000433000-memory.dmp	upx
behavioral2/files/0x000700000001b85a-3.dat	upx
behavioral2/memory/716-6-0x0000000000400000-0x0000000000433000-memory.dmp	upx

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
4548	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	chexzohu.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-07_01863f1ad94264bd77e12d5ba25b5ce6_coinminer_elex_strictor_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
4548	cmd.exe
2836	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
2836	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4552	rundll32.exe
4552	rundll32.exe
4552	rundll32.exe
4552	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4552	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3236	2026-11-07_01863f1ad94264bd77e12d5ba25b5ce6_coinminer_elex_strictor_wannacry.exe
716	chexzohu.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3236 wrote to memory of 4548	3236	2026-11-07_01863f1ad94264bd77e12d5ba25b5ce6_coinminer_elex_strictor_wannacry.exe	88
PID 4548 wrote to memory of 2836	4548	cmd.exe	90
PID 4548 wrote to memory of 716	4548	cmd.exe	91
PID 716 wrote to memory of 4552	716	chexzohu.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-11-07_01863f1ad94264bd77e12d5ba25b5ce6_coinminer_elex_strictor_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-07_01863f1ad94264bd77e12d5ba25b5ce6_coinminer_elex_strictor_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3236
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\chexzohu.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-07_01863f1ad94264bd77e12d5ba25b5ce6_coinminer_elex_strictor_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:4548
- - 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:2836
- - \??\c:\chexzohu.exe
    c:\chexzohu.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-07_01863f1ad94264bd77e12d5ba25b5ce6_coinminer_elex_strictor_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:716
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\yckdlxg\osqkz.dll",init c:\chexzohu.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:4552

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

chexzohu.exe

Path \??\c:\chexzohu.exe
Size 207KB
SHA256 ecbe5f9086716fdf5c697301537ff7812cc5a0e1f066cb43ff76911435dcb8cc
MD5 1d142ede3d17149b7c4611af6b73c59b
SHA1 d597a77d64cafc0cb11e7950f730d36cecef2623
SHA512 8988ec28e5756c806e15ca317c724b872f5b827fc3dddf48fdf374600afe037cc6ea31dec391aba3678c11f0a4d09bf67710d7869a4de4777ac72b8de46810c0
SSDEEP 1536:BJaacz5htqkUla/NGVcJ/gAqcX0JMseuiGSeNVvDi0tMuUJJny3GM+9o8:WaQqc9rqzMseNoVv9EJFnM8o8
TLSH
T18624480277E6C558F1B30B34DA3646F04ABBBC69EA70924F16407E5E7E32A41AD21737
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

osqkz.dll

Path \??\c:\yckdlxg\osqkz.dll
Size 50KB
SHA256 a632527bcd457c9a4cfce83e7a9a675baff790b0279de5d8ea3192dfb2dd888a
MD5 ab32c5bfd7ecfbe9ed733dfb81210933
SHA1 4d5c6e7a0031691f12e78b096ff928b0d55bdfab
SHA512 59b971146292074d76d23d5f26889108f4d6e33804332449f4c589bf8a8d53e37ac8dfea47e9d3c5ae0f382ae1acf25c4968bea87b3f5ff9d51f2274229c1ab5
SSDEEP 1536:mrrG57ZqLLpf+Xz+HOtygmRnO/x5Rq8Gm:mwKGqutWM/x281
TLSH
T12033F1F4EFB4E067ECBA5F743E6A6215DA727B10C63188EA518090135F335CACA18717
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/716-6-0x0000000000400000-0x0000000000433000-memory.dmp

Download

memory/3236-0-0x0000000000400000-0x0000000000433000-memory.dmp

Download

memory/3236-2-0x0000000000400000-0x0000000000433000-memory.dmp

Download

memory/4552-9-0x0000000010000000-0x0000000010032000-memory.dmp

Download

memory/4552-10-0x0000000010000000-0x0000000010032000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads