farfli | 956acd9fb7a1e53eb73e0a4ddc881ce752951aeabaf854a9b3a7e810cf8c511e

General

Target
2026-09-23_7d15d5f48e1f1824bb20d9923093eb99_elex_wannacry.exe
Size 130KB
Sample260923-2wf4hafd74
SHA256 956acd9fb7a1e53eb73e0a4ddc881ce752951aeabaf854a9b3a7e810cf8c511e
MD5 7d15d5f48e1f1824bb20d9923093eb99
SHA1 8b21f121163c610204ba79c8a21631afda2c4904
SHA512 67c792cf57d74547d2148fe8193d543e8e4b1c36444f5c0b89dd8082e17b3c89c839c051af656aec312c2e5301cf6718d3fdc99c4fad204159aeebb5ea89c8d1
SSDEEP 1536:f/6EkrKHqgGFs5N6s7H3dPT+X/O3DX6HZ9am1AEgHZ5bdpDvkDBlxZP1n:fSKP3Pe/Oz67aKVgbbdpDcljZ9n
TLSH
T1CDD3BF527A6085F0E01645335397AB3186B1EC5D3A1813EE93C8EF0FBD65725ECBB298
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 2 IoCs

resource	yara_rule
behavioral2/memory/1596-9-0x0000000010000000-0x0000000010030000-memory.dmp	family_farfli
behavioral2/memory/1596-10-0x0000000010000000-0x0000000010030000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/1596-9-0x0000000010000000-0x0000000010030000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1596-10-0x0000000010000000-0x0000000010030000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 3 IoCs

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

flow	pid	Process
7	1596	rundll32.exe
8	1596	rundll32.exe
10	1596	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
4756	ymptx.exe

Executes dropped EXE 1 IoCs

pid	Process
4756	ymptx.exe

Loads dropped DLL 1 IoCs

pid	Process
1596	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:\\yizgt\\xyeny.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)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	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)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\t:	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)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	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)	\??\j:	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/4600-0-0x0000000000400000-0x000000000041E000-memory.dmp	upx
behavioral2/memory/4600-2-0x0000000000400000-0x000000000041E000-memory.dmp	upx
behavioral2/files/0x0007000000011392-3.dat	upx
behavioral2/memory/4756-6-0x0000000000400000-0x000000000041E000-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
2396	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	2026-09-23_7d15d5f48e1f1824bb20d9923093eb99_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	ymptx.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
2396	cmd.exe
5008	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
5008	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1596	rundll32.exe
1596	rundll32.exe
1596	rundll32.exe
1596	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1596	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4600	2026-09-23_7d15d5f48e1f1824bb20d9923093eb99_elex_wannacry.exe
4756	ymptx.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4600 wrote to memory of 2396	4600	2026-09-23_7d15d5f48e1f1824bb20d9923093eb99_elex_wannacry.exe	89
PID 2396 wrote to memory of 5008	2396	cmd.exe	91
PID 2396 wrote to memory of 4756	2396	cmd.exe	92
PID 4756 wrote to memory of 1596	4756	ymptx.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-09-23_7d15d5f48e1f1824bb20d9923093eb99_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-23_7d15d5f48e1f1824bb20d9923093eb99_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4600
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\ymptx.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-23_7d15d5f48e1f1824bb20d9923093eb99_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:2396
- - 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:5008
- - C:\Users\Admin\AppData\Local\Temp\ymptx.exe
    C:\Users\Admin\AppData\Local\Temp\\ymptx.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-23_7d15d5f48e1f1824bb20d9923093eb99_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4756
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\yizgt\xyeny.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\ymptx.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:1596

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

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

ymptx.exe

Path C:\Users\Admin\AppData\Local\Temp\ymptx.exe
Size 131KB
SHA256 cb457a764d82361cf7a81eb75aef8f207bedc14e8256f878cd68bdb52d88ad2b
MD5 28927c56a706797fa10daec4c6eecca3
SHA1 431755b874c7b677ca2e68db6adc83256333bde5
SHA512 61a924fdedcfd2a9660dfd58a941163c8ebcc3d1546da86871b4139b9bc60a1a2385f9a30175eeb9997fb7e1094e5d1952f86de4e516ea576d75f10543b7257a
SSDEEP 1536:f/6EkrKHqgGFs5N6s7H3dPT+X/O3DX6HZ9am1AEgHZ5bdpDvkDBlxZP1n5:fSKP3Pe/Oz67aKVgbbdpDcljZ9n5
TLSH
T1B0D3BF527A6085F0E01645335397AB3186B1DC5D3A1813EE93C8EF0FBD65B25ECBB298
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

xyeny.dll

Path C:\yizgt\xyeny.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/1596-9-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/1596-10-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/4600-0-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4600-2-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4756-6-0x0000000000400000-0x000000000041E000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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