farfli | 10a09596e5c1253ac890adbad766ce8c11c54ee66cbf505b00fefab1a2681287

Analysis

max time kernel
148s
max time network
137s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
17/10/2026, 12:52

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General

Target
2026-10-16_875d50c8436eabe8cd82fea300a50ce1_coinminer_elex_wannacry.exe
Size 287KB
Sample261017-p375caft9l
SHA256 10a09596e5c1253ac890adbad766ce8c11c54ee66cbf505b00fefab1a2681287
MD5 875d50c8436eabe8cd82fea300a50ce1
SHA1 3dfb9751540e6d8b61f089827b8a3ab5b2b44d88
SHA512 585230a60e6472aa2b9705076a6ed744538095bf31b5b9ea9ddae886ee29d6b1bb684d970964292b55dfe4072a685d13a72b7d75a148f225be4c0bf9a6ce60ae
SSDEEP 3072:qtaoOzbY5l/Tx1DUDcbouGYefD5h1zZCBgb3EInA3rdCKA9bwpfMrgsAHuskkyc7:qtatPE5Txvev1zQBgexOdw6rpI9Fs29n
TLSH
T159547C1233E44869E4EA3E72CE76A630D7F9E875AC33D67B03D4430E5A36A04CB55366
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 4 IoCs

resource	yara_rule
behavioral2/memory/3460-10-0x0000000010000000-0x0000000010038000-memory.dmp	family_farfli
behavioral2/memory/3460-11-0x0000000010000000-0x0000000010038000-memory.dmp	family_farfli
behavioral2/memory/3460-13-0x0000000010000000-0x0000000010038000-memory.dmp	family_farfli
behavioral2/memory/3460-16-0x0000000010000000-0x0000000010038000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 4 IoCs

resource	yara_rule
behavioral2/memory/3460-10-0x0000000010000000-0x0000000010038000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3460-11-0x0000000010000000-0x0000000010038000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3460-13-0x0000000010000000-0x0000000010038000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3460-16-0x0000000010000000-0x0000000010038000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 9 IoCs

resource	yara_rule
behavioral2/memory/2852-0-0x0000000000400000-0x000000000043F000-memory.dmp	UPX
behavioral2/memory/2852-2-0x0000000000400000-0x000000000043F000-memory.dmp	UPX
behavioral2/files/0x0007000000016b39-3.dat	UPX
behavioral2/memory/1480-7-0x0000000000400000-0x000000000043F000-memory.dmp	UPX
behavioral2/files/0x001300000001c486-8.dat	UPX
behavioral2/memory/3460-10-0x0000000010000000-0x0000000010038000-memory.dmp	UPX
behavioral2/memory/3460-11-0x0000000010000000-0x0000000010038000-memory.dmp	UPX
behavioral2/memory/3460-13-0x0000000010000000-0x0000000010038000-memory.dmp	UPX
behavioral2/memory/3460-16-0x0000000010000000-0x0000000010038000-memory.dmp	UPX

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
1480	kufjz.exe

Executes dropped EXE 2 IoCs

pid	Process
1480	kufjz.exe
3460	yei.exe

Loads dropped DLL 1 IoCs

pid	Process
3460	yei.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-1-5-21-53044966-3830981193-2402648431-1000\Software\Microsoft\Windows\CurrentVersion\Run\Vicity = "c:\\Program Files\\qosanty\\yei.exe \"c:\\Program Files\\qosanty\\yeilf.dll\",Group"	yei.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)	\??\o:	yei.exe
File opened (read-only)	\??\u:	yei.exe
File opened (read-only)	\??\x:	yei.exe
File opened (read-only)	\??\y:	yei.exe
File opened (read-only)	\??\p:	yei.exe
File opened (read-only)	\??\q:	yei.exe
File opened (read-only)	\??\t:	yei.exe
File opened (read-only)	\??\v:	yei.exe
File opened (read-only)	\??\w:	yei.exe
File opened (read-only)	\??\a:	yei.exe
File opened (read-only)	\??\d:	yei.exe
File opened (read-only)	\??\g:	yei.exe
File opened (read-only)	\??\h:	yei.exe
File opened (read-only)	\??\j:	yei.exe
File opened (read-only)	\??\l:	yei.exe
File opened (read-only)	\??\i:	yei.exe
File opened (read-only)	\??\n:	yei.exe
File opened (read-only)	\??\r:	yei.exe
File opened (read-only)	\??\s:	yei.exe
File opened (read-only)	\??\z:	yei.exe
File opened (read-only)	\??\b:	yei.exe
File opened (read-only)	\??\k:	yei.exe
File opened (read-only)	\??\m:	yei.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	yei.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x001300000001c486-8.dat	upx
behavioral2/memory/3460-10-0x0000000010000000-0x0000000010038000-memory.dmp	upx
behavioral2/memory/3460-11-0x0000000010000000-0x0000000010038000-memory.dmp	upx
behavioral2/memory/3460-13-0x0000000010000000-0x0000000010038000-memory.dmp	upx
behavioral2/memory/3460-16-0x0000000010000000-0x0000000010038000-memory.dmp	upx

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\qosanty	kufjz.exe
File created	\??\c:\Program Files\qosanty\yeilf.dll	kufjz.exe
File created	\??\c:\Program Files\qosanty\yei.exe	kufjz.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
5880	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	yei.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	yei.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	kufjz.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yei.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-16_875d50c8436eabe8cd82fea300a50ce1_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

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
5880	cmd.exe
5852	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	yei.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	yei.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
5852	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3460	yei.exe
3460	yei.exe
3460	yei.exe
3460	yei.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3460	yei.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2852	2026-10-16_875d50c8436eabe8cd82fea300a50ce1_coinminer_elex_wannacry.exe
1480	kufjz.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2852 wrote to memory of 5880	2852	2026-10-16_875d50c8436eabe8cd82fea300a50ce1_coinminer_elex_wannacry.exe	89
PID 5880 wrote to memory of 5852	5880	cmd.exe	91
PID 5880 wrote to memory of 1480	5880	cmd.exe	92
PID 1480 wrote to memory of 3460	1480	kufjz.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-10-16_875d50c8436eabe8cd82fea300a50ce1_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-16_875d50c8436eabe8cd82fea300a50ce1_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2852
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\kufjz.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-16_875d50c8436eabe8cd82fea300a50ce1_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:5880
- - 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:5852
- - C:\Users\Admin\AppData\Local\Temp\kufjz.exe
    C:\Users\Admin\AppData\Local\Temp\\kufjz.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-16_875d50c8436eabe8cd82fea300a50ce1_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:1480
  - - \??\c:\Program Files\qosanty\yei.exe
      "c:\Program Files\qosanty\yei.exe" "c:\Program Files\qosanty\yeilf.dll",Group C:\Users\Admin\AppData\Local\Temp\kufjz.exe
      4⤵
      Executes dropped EXE
      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

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

Indicator Removal

T1070

File Deletion

T1070.004

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

yei.exe

Path C:\Program Files\qosanty\yei.exe
Size 51KB
SHA256 ce6bb7eddc83762c708d4a41709ae00371dbdc09b2a380f28fa60b1edf917473
MD5 2e068ce2770fde8d1af4cb114b98df1f
SHA1 b6f9c2775babb025b22f915c3047aa627d07c312
SHA512 998d695eb56375e63df7db16740b89deb2cf630ccbead8bcf84a921ec6f4a4f9aef2755b703f7190f332b2008ebcc949363bcf8f392d7d07246c255b5073ed35
SSDEEP 1536:6G9yoVEpHP29I3fbcJboSUge5N+CnC/maz9Rh:8pv2mbcJboce58wvOR
TLSH
T137336C236A0A49B3DFE231780A9D7232526DD862075541F7A61057EAFD243E2EE743CF
MD5 SHA1 SHA512 SSDEEP TLSH

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kufjz.exe

Path C:\Users\Admin\AppData\Local\Temp\kufjz.exe
Size 288KB
SHA256 760184a9290b74163ca002ad3d3866b8f7e8cd1a58b57cc0776c1be4aec5711f
MD5 204fd8e878e71deab4c5f28faf91cc8c
SHA1 4aa940dc8e64a0a6760aca2a1a5aa4f2974dfd86
SHA512 add6c9937ef19b1c25efcf8a409ec78ac537fa94eaf692ec6975fcb2b7bfc202767577ed54388944685a1b8e9b0ed8a15e39fadcfeda5b5071f6d03d115fd1f8
SSDEEP 3072:qtaoOzbY5l/Tx1DUDcbouGYefD5h1zZCBgb3EInA3rdCKA9bwpfMrgsAHuskkycP:qtatPE5Txvev1zQBgexOdw6rpI9Fs29
TLSH
T1C8547C1233E44869E4EA3E72CE76A630D7F9E875AC33D67B03D4430E5A36A04CB55366
MD5 SHA1 SHA512 SSDEEP TLSH

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yeilf.dll

Path \??\c:\Program Files\qosanty\yeilf.dll
Size 97KB
SHA256 7301c8a738c76997435dc704f9b9c008e8ecdcd7b94b7bc4aa54db7dc24b0847
MD5 d74537adb5f618d368048e7c8870bfa7
SHA1 9ff08423fc1c061866282647b8ac6701e890c43e
SHA512 39551d5b1b4086a0c693bed7c4372f16bb8d96fff488b7c62104333109dbf8baa37e3ae108a0a0a1f1fc1a887b9f76a8bd913355b90b28fb96e4cd6644a9978a
SSDEEP 3072:BDpG6gzgHr5tCmfk455ecDBkdq+SStvAbGK:5pG6Sg9txRk/SS6bGK
TLSH
T1A2A301FA290D7DD6CB354839D6528E25F629EE348C589F887ECE7C13ACB8500E1645F1
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1480-7-0x0000000000400000-0x000000000043F000-memory.dmp

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memory/2852-0-0x0000000000400000-0x000000000043F000-memory.dmp

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memory/2852-2-0x0000000000400000-0x000000000043F000-memory.dmp

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memory/3460-10-0x0000000010000000-0x0000000010038000-memory.dmp

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memory/3460-11-0x0000000010000000-0x0000000010038000-memory.dmp

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memory/3460-13-0x0000000010000000-0x0000000010038000-memory.dmp

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memory/3460-16-0x0000000010000000-0x0000000010038000-memory.dmp

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