farfli | af3b388deabf1b1aca3ecb5a4cd8cddfdf508f0636373d7bf84c2f9b94443dff

Analysis

max time kernel
148s
max time network
137s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260710-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
08/08/2026, 16:25

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General

Target
2026-08-08_214cc00a7bc23897c4abff8daed9dc56_elex_wannacry.exe
Size 130KB
Sample260808-tw5svsaj4t
SHA256 af3b388deabf1b1aca3ecb5a4cd8cddfdf508f0636373d7bf84c2f9b94443dff
MD5 214cc00a7bc23897c4abff8daed9dc56
SHA1 e9c372944f65c58f6a90105a49c7392944329b4e
SHA512 2837a09ab06ed307a2cacbb557c24d9e66c7fcedeb8b6d7f0ef350bb42191f0e1c8149f6d8f031648995a30d13b96e271cdb734f63bd39c3d1cd835b992bbd0a
SSDEEP 3072:xK4RNx6nb4RoIw/XBSeral6oaE0HGnvXuEOrc0pA:xl6XYeel6GGGVOK
TLSH
T106D38D429BB189E5E0111CF4039BBB3583B5988D3B15A363D388DF0EE42DE85DB362D9
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 5 IoCs

resource	yara_rule
behavioral2/memory/1384-10-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/1384-12-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/1384-13-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/1384-14-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/1384-17-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral2/memory/1384-10-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1384-12-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1384-13-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1384-14-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1384-17-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 8 IoCs

resource	yara_rule
behavioral2/memory/2772-6-0x0000000000400000-0x0000000000417000-memory.dmp	UPX
behavioral2/files/0x000e00000001c32a-7.dat	UPX
behavioral2/memory/1384-9-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1384-10-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1384-12-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1384-13-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1384-14-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1384-17-0x0000000010000000-0x0000000010024000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
4	1384	rundll32.exe
10	1384	rundll32.exe
11	1384	rundll32.exe
12	1384	rundll32.exe
13	1384	rundll32.exe
15	1384	rundll32.exe
17	1384	rundll32.exe
19	1384	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000e00000001c32a-7.dat	acprotect

Deletes itself 1 IoCs

pid	Process
2772	cgsejluf.exe

Executes dropped EXE 1 IoCs

pid	Process
2772	cgsejluf.exe

Loads dropped DLL 1 IoCs

pid	Process
1384	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-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\cusanrh\\yhifl.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)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\g:	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)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\t:	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/0x000e00000001c32a-7.dat	upx
behavioral2/memory/1384-9-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1384-10-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1384-12-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1384-13-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1384-14-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1384-17-0x0000000010000000-0x0000000010024000-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
2192	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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cgsejluf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-08_214cc00a7bc23897c4abff8daed9dc56_elex_wannacry.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
2192	cmd.exe
4236	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
4236	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1384	rundll32.exe
1384	rundll32.exe
1384	rundll32.exe
1384	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1384	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4536	2026-08-08_214cc00a7bc23897c4abff8daed9dc56_elex_wannacry.exe
2772	cgsejluf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4536 wrote to memory of 2192	4536	2026-08-08_214cc00a7bc23897c4abff8daed9dc56_elex_wannacry.exe	89
PID 2192 wrote to memory of 4236	2192	cmd.exe	91
PID 2192 wrote to memory of 2772	2192	cmd.exe	92
PID 2772 wrote to memory of 1384	2772	cgsejluf.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-08_214cc00a7bc23897c4abff8daed9dc56_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_214cc00a7bc23897c4abff8daed9dc56_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4536
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\cgsejluf.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-08_214cc00a7bc23897c4abff8daed9dc56_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:2192
- - 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:4236
- - \??\c:\cgsejluf.exe
    c:\cgsejluf.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-08_214cc00a7bc23897c4abff8daed9dc56_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2772
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\cusanrh\yhifl.dll",init c:\cgsejluf.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:1384

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

cgsejluf.exe

Path \??\c:\cgsejluf.exe
Size 130KB
SHA256 253d9b7d05c9e14f35eec15d2c8083e6685c6fcf1739ec4fbb7a1ddda889dce8
MD5 26f367a9e9c337c7270635857ef2d5b0
SHA1 b75da935b674b56ff3c20094442162d79105ec0b
SHA512 fe13c945b5b27b4fdf4a20cd5eacf38aa04d662d1369e0f496e6570e2b4c9d2a4f16ae324e3ae93228edf54b62a521b00d46378ec4f700b97265f7e374541297
SSDEEP 3072:xK4RNx6nb4RoIw/XBSeral6oaE0HGnvXuEOrc0pZ:xl6XYeel6GGGVOb
TLSH
T1D2D38C529BB189E5E0111CF4039BBB3583B5988D3B14A367D388DF0EE42DE45DB362D9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

yhifl.dll

Path \??\c:\cusanrh\yhifl.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/1384-9-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1384-10-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1384-12-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1384-13-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1384-14-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1384-17-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/2772-6-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4536-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4536-2-0x0000000000400000-0x0000000000417000-memory.dmp

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