farfli | fe82e728320be924a9471df8d9ae779ca4f19b9a3ad5092b097e8810d771629b

Analysis

max time kernel
148s
max time network
149s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
20/07/2026, 07:37

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General

Target
2026-07-20_a6f93ffc540af5a65866b26927067693_elex_wannacry.exe
Size 111KB
Sample260720-jf6ecaas8m
SHA256 fe82e728320be924a9471df8d9ae779ca4f19b9a3ad5092b097e8810d771629b
MD5 a6f93ffc540af5a65866b26927067693
SHA1 e5160e4ee2fcbdc046aa55d7273958f612d66992
SHA512 b5709d55b0460305755aba605f9beb7f176a1f985f2af7da0954c53c28d56c602f689caba65f2347724c4db906b38f997f972629fb4fe3e5a97815e2ffba90a9
SSDEEP 1536:agDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIcIWlmyyF:ELRrO10TiJD9yjqrilyxOWPy
TLSH
T1B8B3AD5D6D62C49EE4014B7043579725A6A2AC5DFA304F334380BA4EFF36E0BEDE9198
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery execution farfli persistence spyware stealer

Malware Config

Signatures

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

Detects Farfli Backdoor 3 IoCs

resource	yara_rule
behavioral2/memory/4460-11-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/4460-14-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/4460-15-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/4460-11-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4460-14-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4460-15-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
7	4460	rundll32.exe
8	4460	rundll32.exe
9	4460	rundll32.exe
11	4460	rundll32.exe
12	4460	rundll32.exe
14	4460	rundll32.exe
15	4460	rundll32.exe
17	4460	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4528	owjypk.exe

Executes dropped EXE 1 IoCs

pid	Process
4528	owjypk.exe

Loads dropped DLL 1 IoCs

pid	Process
4460	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-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\silxav\\tktuf.dll\",QueryPluginInterface"	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)	\??\r:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	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)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\q:	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

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
1344	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	2026-07-20_a6f93ffc540af5a65866b26927067693_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	owjypk.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
1344	cmd.exe
4580	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
4580	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4460	rundll32.exe
4460	rundll32.exe
4460	rundll32.exe
4460	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4460	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5532	2026-07-20_a6f93ffc540af5a65866b26927067693_elex_wannacry.exe
4528	owjypk.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5532 wrote to memory of 1344	5532	2026-07-20_a6f93ffc540af5a65866b26927067693_elex_wannacry.exe	89
PID 1344 wrote to memory of 4580	1344	cmd.exe	91
PID 1344 wrote to memory of 4528	1344	cmd.exe	92
PID 4528 wrote to memory of 4460	4528	owjypk.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-20_a6f93ffc540af5a65866b26927067693_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_a6f93ffc540af5a65866b26927067693_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5532
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\owjypk.exe "C:\Users\Admin\AppData\Local\Temp\2026-07-20_a6f93ffc540af5a65866b26927067693_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:1344
- - 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:4580
- - C:\Users\Admin\AppData\Local\Temp\owjypk.exe
    C:\Users\Admin\AppData\Local\Temp\\owjypk.exe "C:\Users\Admin\AppData\Local\Temp\2026-07-20_a6f93ffc540af5a65866b26927067693_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4528
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\silxav\tktuf.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\owjypk.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:4460

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

owjypk.exe

Path C:\Users\Admin\AppData\Local\Temp\owjypk.exe
Size 111KB
SHA256 020b7cd10dec582cf5d5fcf6e17d265c9edb8a2a65e6f11795729703c661eb5f
MD5 d56dd1f656bfd0e7c36986ae1c83afc8
SHA1 39ddef2fb16b2f7c047ad748eb7ff0419901361a
SHA512 201a143d701780f0d43772c6786253819d3cf31e4c26585265846ee168bf305e035ece34c47ca0c1cf033ed9af8d7d09c793d9c443e2c90b7ff353a858465075
SSDEEP 1536:agDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIcIWlmyyFf:ELRrO10TiJD9yjqrilyxOWPy5
TLSH
T193B3AD5D6D62C49EE4014B7047579725A2A2AC5DFA304F334380BA4EFF36E0BEDE9198
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

tktuf.dll

Path \??\c:\silxav\tktuf.dll
Size 44KB
SHA256 9111c1eb1f0b59dcd49cfd5a0abc0ba100ac59a3bcae8623ff091dfdc46fed3c
MD5 0f12a7d509b2c9bb9b4cd6d8a0325e86
SHA1 f5fb59ad4f0633d115b06f35a2dc161dc4367157
SHA512 e3c84a643ff0a2627daba8a056221985a472aaf07bade61b3e9459db4bfc8792c1347606911e3fcc01581508004b18b5435bcccd5e7617cc6d091f37a5f42e7f
SSDEEP 768:DICzePjle2367kjhrXLdCuYMW8QVnwrLDGe/brbtJyOTuXfADVjeJ2i/MVJWAE:DDePjA23Ukjh37YMonwrvGybrbbRCf4E
TLSH
T1FD23F1A7B94E8D4FC0AE41F7078FC8D422B5589A97A7CB4626008F216CC4FB07E52376
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4460-9-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/4460-10-0x00000000025B0000-0x00000000025B2000-memory.dmp

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memory/4460-11-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/4460-12-0x00000000025B0000-0x00000000025B2000-memory.dmp

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memory/4460-14-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/4460-15-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/4528-6-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/5532-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/5532-2-0x0000000000400000-0x0000000000417000-memory.dmp

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