farfli | 03c1583663e804f552c1c9a0f199cd7bde06a34054c52cc234ef337eebbfbb36

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
24/09/2026, 10:41

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General

Target
2026-09-23_3a2101665a3c92ed19190474fa47048e_elex_wannacry.exe
Size 92KB
Sample260924-mrcsysbf32
SHA256 03c1583663e804f552c1c9a0f199cd7bde06a34054c52cc234ef337eebbfbb36
MD5 3a2101665a3c92ed19190474fa47048e
SHA1 a361aab9db08e1b0a3ddf814659c3aca57cb5554
SHA512 7c98f9c22ef04ba948dfc9b9db33c78868233a5c63f245176ac3923a748630cc72329defbf13c6c6d1ad48ccb8af7e7d01420faee46f6936a3bed4d6bcc383ac
SSDEEP 1536:SaK4RNx6nb4RoIw/vvBSxXsral6x2aE0zLve2yESXGTBcvt8UaKW40AEEoa:xK4RNx6nb4RoIw/XBSeral6oaE0HGnvJ
TLSH
T1B493BE47ABA50DD5E1204DF401AB7B36537694892B26A787D388DE0DA43EDC0DF362CE
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 5 IoCs

resource	yara_rule
behavioral2/memory/4036-10-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/4036-12-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/4036-13-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/4036-14-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/4036-15-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral2/memory/4036-10-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4036-12-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4036-13-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4036-14-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4036-15-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 8 IoCs

resource	yara_rule
behavioral2/memory/3992-6-0x0000000000400000-0x0000000000417000-memory.dmp	UPX
behavioral2/files/0x000d00000001c602-7.dat	UPX
behavioral2/memory/4036-9-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/4036-10-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/4036-12-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/4036-13-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/4036-14-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/4036-15-0x0000000010000000-0x0000000010024000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
2	4036	rundll32.exe
5	4036	rundll32.exe
6	4036	rundll32.exe
7	4036	rundll32.exe
9	4036	rundll32.exe
10	4036	rundll32.exe
12	4036	rundll32.exe
13	4036	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000d00000001c602-7.dat	acprotect

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
3992	gybdjqljy.exe

Executes dropped EXE 1 IoCs

pid	Process
3992	gybdjqljy.exe

Loads dropped DLL 1 IoCs

pid	Process
4036	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:\\iiser\\gtmmoiux.dll\",init"	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)	\??\o:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	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)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	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 7 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000d00000001c602-7.dat	upx
behavioral2/memory/4036-9-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/4036-10-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/4036-12-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/4036-13-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/4036-14-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/4036-15-0x0000000010000000-0x0000000010024000-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
3656	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_3a2101665a3c92ed19190474fa47048e_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	gybdjqljy.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
3656	cmd.exe
3788	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	rundll32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3788	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4036	rundll32.exe
4036	rundll32.exe
4036	rundll32.exe
4036	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4036	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1840	2026-09-23_3a2101665a3c92ed19190474fa47048e_elex_wannacry.exe
3992	gybdjqljy.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1840 wrote to memory of 3656	1840	2026-09-23_3a2101665a3c92ed19190474fa47048e_elex_wannacry.exe	88
PID 3656 wrote to memory of 3788	3656	cmd.exe	90
PID 3656 wrote to memory of 3992	3656	cmd.exe	91
PID 3992 wrote to memory of 4036	3992	gybdjqljy.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-09-23_3a2101665a3c92ed19190474fa47048e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-23_3a2101665a3c92ed19190474fa47048e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1840
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\gybdjqljy.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-23_3a2101665a3c92ed19190474fa47048e_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:3656
- - 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:3788
- - \??\c:\gybdjqljy.exe
    c:\gybdjqljy.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-23_3a2101665a3c92ed19190474fa47048e_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3992
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\iiser\gtmmoiux.dll",init c:\gybdjqljy.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:4036

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

gybdjqljy.exe

Path \??\c:\gybdjqljy.exe
Size 92KB
SHA256 2346109076ab528d6981e1bb4a20a967398e737d5ca4eb02e8e951fd50c471ab
MD5 47180bb78d8e90e7b4f4c777e1fea9f1
SHA1 6edfe985adca179caf60ca2d781c5a6114085ed0
SHA512 768a1a445c685aa2d635f691d24d5df2c6161653d1ac68c71f2d6dbc08c5853068c8c38520a1925971bd132b65f62fbb25bb504657b81f912d35f2cc5cd76833
SSDEEP 1536:SaK4RNx6nb4RoIw/vvBSxXsral6x2aE0zLve2yESXGTBcvt8UaKW40AEEo4:xK4RNx6nb4RoIw/XBSeral6oaE0HGnvH
TLSH
T17D93BE47ABA50DD5E1214DF401AB7B36537694892B25A787C388DE0EA43EDC0DF362CE
MD5 SHA1 SHA512 SSDEEP TLSH

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gtmmoiux.dll

Path \??\c:\iiser\gtmmoiux.dll
Size 46KB
SHA256 b6bc7902da0250f6ca920b35b222f6a0fe62102caf05d2a1722c4d3b225a0a9e
MD5 42fe886bcb6460f7c2a46e21ecac5da6
SHA1 7d9a1c9fe17121cf61444da965f29e974a95ede2
SHA512 3d1a7dc1d9ca8a4376302ba20df584ad59b98e0d3b18b06b22d7f5a455833ce124e412fc1922a3b704dcbafa31987cda3115c9a71dd6299683502cebae33567c
SSDEEP 768:P60NIyOvlPSGxZ00FBsMT0fdB5h3vU7ExCClpoduUglNgLoR/C:P6e4lP5rvz1Vd8H/C
TLSH
T10023F15733A8577BC9E621FA3263BE142B357019CB3A83545CB9B6572C21C8D927930F
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1840-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/1840-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/3992-6-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4036-9-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/4036-10-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/4036-12-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/4036-13-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/4036-14-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/4036-15-0x0000000010000000-0x0000000010024000-memory.dmp

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