farfli | 31442cdd131108ed70680cd62ff6aecbf2ed3048bfde9808e00d8e9d043de84a

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
20/10/2026, 20:07

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General

Target
2026-10-19_5521c0b30e3de4d0680b3bc71c8d5eff_elex_wannacry.exe
Size 401KB
Sample261020-yv8wcaev31
SHA256 31442cdd131108ed70680cd62ff6aecbf2ed3048bfde9808e00d8e9d043de84a
MD5 5521c0b30e3de4d0680b3bc71c8d5eff
SHA1 9e90a5cfa41ab482efa35c8ddc174f1bcb929ead
SHA512 7ac9aafaab1c59f9fc95efedd6352cdffe41499810c6c1a5882878b8bca07be006155514490e82883717820a1fcc0d5fb96b68a72b38ca639cd4a6fea2bf4729
SSDEEP 6144:WtecHBTStjVfs3mCL17O/cvARZZWcStoWwABr8iXpXxr2kDQH6L:oHBTAjBqbYkvqZMcV7i32iT
TLSH
T1D394CF2332C0C8B7D1D17373FEE6AA72E3F5C2A85D396A7753DA014D1E2744C92162A9
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 6 IoCs

resource	yara_rule
behavioral2/memory/5524-14-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/5524-12-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/5524-11-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/5524-16-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/5524-18-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/5524-20-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 6 IoCs

resource	yara_rule
behavioral2/memory/5524-14-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5524-12-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5524-11-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5524-16-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5524-18-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5524-20-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
4312	bljhp.exe

Executes dropped EXE 2 IoCs

pid	Process
4312	bljhp.exe
5524	gfa.exe

Loads dropped DLL 1 IoCs

pid	Process
5524	gfa.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-1-5-21-4057491610-3392471755-192832105-1000\Software\Microsoft\Windows\CurrentVersion\Run\DESIME = "c:\\Program Files\\iludtsu\\gfa.exe \"c:\\Program Files\\iludtsu\\gfakx.dll\",DoPrivacy"	gfa.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)	\??\w:	gfa.exe
File opened (read-only)	\??\y:	gfa.exe
File opened (read-only)	\??\z:	gfa.exe
File opened (read-only)	\??\h:	gfa.exe
File opened (read-only)	\??\j:	gfa.exe
File opened (read-only)	\??\l:	gfa.exe
File opened (read-only)	\??\m:	gfa.exe
File opened (read-only)	\??\o:	gfa.exe
File opened (read-only)	\??\p:	gfa.exe
File opened (read-only)	\??\s:	gfa.exe
File opened (read-only)	\??\b:	gfa.exe
File opened (read-only)	\??\g:	gfa.exe
File opened (read-only)	\??\q:	gfa.exe
File opened (read-only)	\??\t:	gfa.exe
File opened (read-only)	\??\u:	gfa.exe
File opened (read-only)	\??\a:	gfa.exe
File opened (read-only)	\??\d:	gfa.exe
File opened (read-only)	\??\k:	gfa.exe
File opened (read-only)	\??\n:	gfa.exe
File opened (read-only)	\??\x:	gfa.exe
File opened (read-only)	\??\i:	gfa.exe
File opened (read-only)	\??\r:	gfa.exe
File opened (read-only)	\??\v:	gfa.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	gfa.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1844-0-0x0000000000400000-0x0000000000499000-memory.dmp	upx
behavioral2/memory/1844-2-0x0000000000400000-0x0000000000499000-memory.dmp	upx
behavioral2/files/0x001200000001b681-3.dat	upx
behavioral2/memory/4312-7-0x0000000000400000-0x0000000000499000-memory.dmp	upx

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\iludtsu	bljhp.exe
File created	\??\c:\Program Files\iludtsu\gfakx.dll	bljhp.exe
File created	\??\c:\Program Files\iludtsu\gfa.exe	bljhp.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
5148	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 1 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	gfa.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	2026-10-19_5521c0b30e3de4d0680b3bc71c8d5eff_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	bljhp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	gfa.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
5148	cmd.exe
5512	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	gfa.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	gfa.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
5512	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5524	gfa.exe
5524	gfa.exe
5524	gfa.exe
5524	gfa.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5524	gfa.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1844	2026-10-19_5521c0b30e3de4d0680b3bc71c8d5eff_elex_wannacry.exe
4312	bljhp.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1844 wrote to memory of 5148	1844	2026-10-19_5521c0b30e3de4d0680b3bc71c8d5eff_elex_wannacry.exe	90
PID 5148 wrote to memory of 5512	5148	cmd.exe	92
PID 5148 wrote to memory of 4312	5148	cmd.exe	93
PID 4312 wrote to memory of 5524	4312	bljhp.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-19_5521c0b30e3de4d0680b3bc71c8d5eff_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-19_5521c0b30e3de4d0680b3bc71c8d5eff_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1844
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\bljhp.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-19_5521c0b30e3de4d0680b3bc71c8d5eff_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:5148
- - 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:5512
- - C:\Users\Admin\AppData\Local\Temp\bljhp.exe
    C:\Users\Admin\AppData\Local\Temp\\bljhp.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-19_5521c0b30e3de4d0680b3bc71c8d5eff_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:4312
  - - \??\c:\Program Files\iludtsu\gfa.exe
      "c:\Program Files\iludtsu\gfa.exe" "c:\Program Files\iludtsu\gfakx.dll",DoPrivacy C:\Users\Admin\AppData\Local\Temp\bljhp.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:5524

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

gfa.exe

Path C:\Program Files\iludtsu\gfa.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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bljhp.exe

Path C:\Users\Admin\AppData\Local\Temp\bljhp.exe
Size 401KB
SHA256 525b53a2e3ff69a222c555e9b9317b187dce0c5f03c02c738cc8307a2fd7854f
MD5 849bb6288c36102c3b8215867d1f784e
SHA1 9e30047932c9d96fb48f33c9c721927bcb5e9183
SHA512 b2ee4b1993184c7f11ddc046f704fcbeb989fe00d8c6cc4949e6edb98886a5b0e48a4141b887c212867926dca1e7b1c1eded6c5dd2e8b772bc8fe3bf6b54a813
SSDEEP 6144:WtecHBTStjVfs3mCL17O/cvARZZWcStoWwABr8iXpXxr2kDQH6LE:oHBTAjBqbYkvqZMcV7i32iTI
TLSH
T16294CF2332C0C8B7D1D17373FEE6AA72E3F5C2A85D396A7753DA014D1E2744C92162A9
MD5 SHA1 SHA512 SSDEEP TLSH

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gfakx.dll

Path \??\c:\Program Files\iludtsu\gfakx.dll
Size 219KB
SHA256 b398486fee786c62ab50dd6671994feb8e04a324bf82f02ffcb9ab62059812b4
MD5 1bc3a32d60bb036eeec4978822a37fab
SHA1 7f45fb886b881a075a6004a7317d55ef9e9d2a70
SHA512 644f9ea41051d2580017325edce4ae17e705daa3375d8e28954493168113c1973fc9381e8a430cb15333e7a6653fff7380741f7a9ab9d25b8f6c65d18a50c7e0
SSDEEP 6144:XxDink0qeQKc/A8MNfnX2p2KL5aI3iMKK:XAk9uNfnX2p2Q5aIxx
TLSH
T15E2413C4FF52EECEE8610AF03B4FA265DF705C6BC48202C114EE58535A65EA3F695701
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1844-0-0x0000000000400000-0x0000000000499000-memory.dmp

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memory/1844-2-0x0000000000400000-0x0000000000499000-memory.dmp

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memory/4312-7-0x0000000000400000-0x0000000000499000-memory.dmp

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memory/5524-15-0x0000000001380000-0x0000000001381000-memory.dmp

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memory/5524-14-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/5524-12-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/5524-11-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/5524-16-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/5524-18-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/5524-20-0x0000000010000000-0x000000001005A000-memory.dmp

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