farfli | f76dd823bb9d549deb295d6be2eb2f52d5b836bdf2cb238aeba26e7be43f9bcb

General

Target
2026-08-15_d85078b60179316ac1a55baf1051daaf_elex_wannacry.exe
Size 133KB
Sample260815-fx413azxfx
SHA256 f76dd823bb9d549deb295d6be2eb2f52d5b836bdf2cb238aeba26e7be43f9bcb
MD5 d85078b60179316ac1a55baf1051daaf
SHA1 2b7fa82ad7d58e20c5522fb8a6052807126b8eb4
SHA512 137fd8a5790ce974deb95ef6706483fb6655e24e6293622e6ea241c4ebe4205b6b0d1fdfe682671f4411c62ee53ae1943ff046755f3b3f381fa9905358d9db9f
SSDEEP 1536:C/6EkrKHqgGFs5/Z6s7H3dPT+X/O3DX6HZ9am1AEgHZ5bdpDvkDBlxZP1nW:CSKPRdPe/Oz67aKVgbbdpDcljZ9nW
TLSH
T1D4D3BE527A6485F0E01645331397AB328AB1DC5E7A1803FE93C8EF0FBD657219CB7299
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 2 IoCs

resource	yara_rule
behavioral2/memory/5604-9-0x0000000010000000-0x0000000010030000-memory.dmp	family_farfli
behavioral2/memory/5604-10-0x0000000010000000-0x0000000010030000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/5604-9-0x0000000010000000-0x0000000010030000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5604-10-0x0000000010000000-0x0000000010030000-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	5604	rundll32.exe
9	5604	rundll32.exe
8	5604	rundll32.exe
11	5604	rundll32.exe
12	5604	rundll32.exe
14	5604	rundll32.exe
15	5604	rundll32.exe
17	5604	rundll32.exe

Deletes itself 1 IoCs

pid	Process
336	pgtil.exe

Executes dropped EXE 1 IoCs

pid	Process
336	pgtil.exe

Loads dropped DLL 1 IoCs

pid	Process
5604	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:\\reigr\\wtxtm.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)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	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)	\??\r:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	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/2396-0-0x0000000000400000-0x000000000041E000-memory.dmp	upx
behavioral2/memory/2396-2-0x0000000000400000-0x000000000041E000-memory.dmp	upx
behavioral2/files/0x0008000000016b4d-3.dat	upx
behavioral2/memory/336-6-0x0000000000400000-0x000000000041E000-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
4212	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	2026-08-15_d85078b60179316ac1a55baf1051daaf_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	pgtil.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
4212	cmd.exe
4172	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
4172	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5604	rundll32.exe
5604	rundll32.exe
5604	rundll32.exe
5604	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5604	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2396	2026-08-15_d85078b60179316ac1a55baf1051daaf_elex_wannacry.exe
336	pgtil.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2396 wrote to memory of 4212	2396	2026-08-15_d85078b60179316ac1a55baf1051daaf_elex_wannacry.exe	88
PID 4212 wrote to memory of 4172	4212	cmd.exe	91
PID 4212 wrote to memory of 336	4212	cmd.exe	92
PID 336 wrote to memory of 5604	336	pgtil.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-15_d85078b60179316ac1a55baf1051daaf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-15_d85078b60179316ac1a55baf1051daaf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2396
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\pgtil.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-15_d85078b60179316ac1a55baf1051daaf_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:4212
- - 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:4172
- - C:\Users\Admin\AppData\Local\Temp\pgtil.exe
    C:\Users\Admin\AppData\Local\Temp\\pgtil.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-15_d85078b60179316ac1a55baf1051daaf_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:336
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\reigr\wtxtm.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\pgtil.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:5604

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

Modify Registry

1

T1112

Pre-OS Boot

1

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

1

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

pgtil.exe

Path C:\Users\Admin\AppData\Local\Temp\pgtil.exe
Size 133KB
SHA256 92f54a8791adeb506e6f1105ed07073b7f5476ec83a68b8cea170eeb17cc8554
MD5 b7686a7eba4b6e8f6bae9b2bc992cfac
SHA1 5d2d2e8076485350408443906152186cc0d8f224
SHA512 dc6a3d14c5ed0dfe9363913ccd8598b870fd6d7109f4c93ef8ecdd9e42aa831632d4fbf7c502bef9719f2b0ac7713ad68e98132c6fd146c3bcc61bdd0a1f567a
SSDEEP 1536:C/6EkrKHqgGFs5/Z6s7H3dPT+X/O3DX6HZ9am1AEgHZ5bdpDvkDBlxZP1nR:CSKPRdPe/Oz67aKVgbbdpDcljZ9nR
TLSH
T1E7D3AF527A6485F0E01645331397AB3186B1DC5E7A1803FE93C8EF0FBD657259CBB298
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

wtxtm.dll

Path \??\c:\reigr\wtxtm.dll
Size 59KB
SHA256 12264670242948b129acc4d9cd80cdf83fac88e662c09a57ce5ac6b39510618d
MD5 8552951ec6ab253e038ffc809235b08c
SHA1 c59e347bfebd96c0e4b60a0d33b5923fb137af55
SHA512 17864dfff89f397c647ec02926cfd639e33a05061cb6164756afd3d8c4e24281cba9c4770d16927ba56e1e02a139faf970748bfe07454f4528eab9f87e2c0cd9
SSDEEP 1536:x0u5H+DyujZ2uoHzCf/IYmRGMJnc7Z4ch:x04eDyY/oH8SIMJncNnh
TLSH
T12843F21CE351855BDAAB0672678F6F407A238A7F5B32485A914C2454BF3BE77C937380
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/336-6-0x0000000000400000-0x000000000041E000-memory.dmp

Download

memory/2396-0-0x0000000000400000-0x000000000041E000-memory.dmp

Download

memory/2396-2-0x0000000000400000-0x000000000041E000-memory.dmp

Download

memory/5604-9-0x0000000010000000-0x0000000010030000-memory.dmp

Download

memory/5604-10-0x0000000010000000-0x0000000010030000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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