farfli | 4296d0f38cd5a0e91b2359cdb28216e2bef34d0db96ca852714534383ffcb33f

Analysis

max time kernel
148s
max time network
136s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
12/09/2026, 22:16

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General

Target
2026-09-12_8622f8f29963b36cf6e7d8305d57d3c2_elex_wannacry.exe
Size 406KB
Sample260912-169m5aba22
SHA256 4296d0f38cd5a0e91b2359cdb28216e2bef34d0db96ca852714534383ffcb33f
MD5 8622f8f29963b36cf6e7d8305d57d3c2
SHA1 e4eb6af3397d5a3c72205eafe4be392a710eb538
SHA512 4b1caeaffb99ee071263b0f9e759cdf20ba8972a4dcaf7f3e897db5a372bd7d815c9425b40c29b41724cdc6e0b83a8bd5a9bb73b45c29d91cf91942c9931dcfd
SSDEEP 6144:JtecHBTSpjVfs3mCL17O/cvARZZWcStoWwABr8iXpXxr2kDQH/9:nHBTwjBqbYkvqZMcV7i32ie
TLSH
T1A594CF2332C1C8A7C1D17373FEE2B672E3F5C2A85D356A7753EA025D1E2744C92162A9
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/3880-13-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/3880-11-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/3880-16-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/3880-18-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/3880-21-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral2/memory/3880-13-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3880-11-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3880-16-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3880-18-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3880-21-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Deletes itself 1 IoCs

pid	Process
4156	zsfmme.exe

Executes dropped EXE 2 IoCs

pid	Process
4156	zsfmme.exe
3880	nnb.exe

Loads dropped DLL 1 IoCs

pid	Process
3880	nnb.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-1-5-21-1704430598-3087477806-3297458608-1000\Software\Microsoft\Windows\CurrentVersion\Run\DESIME = "c:\\Program Files\\zfxly\\nnb.exe \"c:\\Program Files\\zfxly\\nnbws.dll\",DoPrivacy"	nnb.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)	\??\t:	nnb.exe
File opened (read-only)	\??\v:	nnb.exe
File opened (read-only)	\??\w:	nnb.exe
File opened (read-only)	\??\h:	nnb.exe
File opened (read-only)	\??\i:	nnb.exe
File opened (read-only)	\??\n:	nnb.exe
File opened (read-only)	\??\o:	nnb.exe
File opened (read-only)	\??\u:	nnb.exe
File opened (read-only)	\??\x:	nnb.exe
File opened (read-only)	\??\z:	nnb.exe
File opened (read-only)	\??\a:	nnb.exe
File opened (read-only)	\??\b:	nnb.exe
File opened (read-only)	\??\d:	nnb.exe
File opened (read-only)	\??\s:	nnb.exe
File opened (read-only)	\??\j:	nnb.exe
File opened (read-only)	\??\k:	nnb.exe
File opened (read-only)	\??\r:	nnb.exe
File opened (read-only)	\??\y:	nnb.exe
File opened (read-only)	\??\g:	nnb.exe
File opened (read-only)	\??\l:	nnb.exe
File opened (read-only)	\??\m:	nnb.exe
File opened (read-only)	\??\p:	nnb.exe
File opened (read-only)	\??\q:	nnb.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	nnb.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2488-0-0x0000000000400000-0x0000000000499000-memory.dmp	upx
behavioral2/memory/2488-2-0x0000000000400000-0x0000000000499000-memory.dmp	upx
behavioral2/files/0x00160000000115bb-3.dat	upx
behavioral2/memory/4156-7-0x0000000000400000-0x0000000000499000-memory.dmp	upx

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	\??\c:\Program Files\zfxly\nnb.exe	zsfmme.exe
File opened for modification	\??\c:\Program Files\zfxly	zsfmme.exe
File created	\??\c:\Program Files\zfxly\nnbws.dll	zsfmme.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
4896	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	zsfmme.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	nnb.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-12_8622f8f29963b36cf6e7d8305d57d3c2_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
4456	PING.EXE
4896	cmd.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	nnb.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	nnb.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4456	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3880	nnb.exe
3880	nnb.exe
3880	nnb.exe
3880	nnb.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3880	nnb.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2488	2026-09-12_8622f8f29963b36cf6e7d8305d57d3c2_elex_wannacry.exe
4156	zsfmme.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2488 wrote to memory of 4896	2488	2026-09-12_8622f8f29963b36cf6e7d8305d57d3c2_elex_wannacry.exe	88
PID 4896 wrote to memory of 4456	4896	cmd.exe	90
PID 4896 wrote to memory of 4156	4896	cmd.exe	91
PID 4156 wrote to memory of 3880	4156	zsfmme.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-09-12_8622f8f29963b36cf6e7d8305d57d3c2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-12_8622f8f29963b36cf6e7d8305d57d3c2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2488
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\zsfmme.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-12_8622f8f29963b36cf6e7d8305d57d3c2_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:4896
- - 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:4456
- - C:\Users\Admin\AppData\Local\Temp\zsfmme.exe
    C:\Users\Admin\AppData\Local\Temp\\zsfmme.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-12_8622f8f29963b36cf6e7d8305d57d3c2_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4156
  - - \??\c:\Program Files\zfxly\nnb.exe
      "c:\Program Files\zfxly\nnb.exe" "c:\Program Files\zfxly\nnbws.dll",DoPrivacy C:\Users\Admin\AppData\Local\Temp\zsfmme.exe
      4⤵
      Executes dropped EXE
      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:3880

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

Replay Monitor

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Downloads

nnb.exe

Path C:\Program Files\zfxly\nnb.exe
Size 51KB
SHA256 ce6bb7eddc83762c708d4a41709ae00371dbdc09b2a380f28fa60b1edf917473
MD5 2e068ce2770fde8d1af4cb114b98df1f
SHA1 b6f9c2775babb025b22f915c3047aa627d07c312
SHA512 998d695eb56375e63df7db16740b89deb2cf630ccbead8bcf84a921ec6f4a4f9aef2755b703f7190f332b2008ebcc949363bcf8f392d7d07246c255b5073ed35
SSDEEP 1536:6G9yoVEpHP29I3fbcJboSUge5N+CnC/maz9Rh:8pv2mbcJboce58wvOR
TLSH
T137336C236A0A49B3DFE231780A9D7232526DD862075541F7A61057EAFD243E2EE743CF
MD5 SHA1 SHA512 SSDEEP TLSH

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zsfmme.exe

Path C:\Users\Admin\AppData\Local\Temp\zsfmme.exe
Size 407KB
SHA256 9a78e2cdbddfa6acc99eee5c680552f7ea041e7d9072db4734475c7a5f033d94
MD5 d9048d240bb9fee11d607abd99932b97
SHA1 4e46d780c0dffae62ba6be6e44a3ffa351f346b2
SHA512 4af1f8b5358dbdd48ee1914a55e209e391d8d3f9f1c8206b0504f3bd1ab87065a34755a5db139289283b04619aac5ea4e3a403b5aba47284ccd0b4be375acaf4
SSDEEP 6144:JtecHBTSpjVfs3mCL17O/cvARZZWcStoWwABr8iXpXxr2kDQH/9:nHBTwjBqbYkvqZMcV7i32ie
TLSH
T1B894CF2332C1C8A7C1D17373FEE2B672E3F5C2A85D356A7753EA025D1E2744C92162A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

nnbws.dll

Path \??\c:\Program Files\zfxly\nnbws.dll
Size 219KB
SHA256 d5f1e01bce57bcc0e657a2eacdcee64c65529e5b898de22b9574c1c04186f26f
MD5 a7bd0f69e27f1e2fc92b0ed3689842af
SHA1 5a13a5ff8c74c59b280204fef46f967bebcf2302
SHA512 124612d3fd0546555a36b2296964436cd9b1112cf9f0ee1f0fa14fe4e5e159b2bf10341c971867fff07f2a7d51441cd95be23323e083ccac5ca7a0cff304c1d7
SSDEEP 6144:XxDink0qeQKc/A8MNfnX2p2KL5aI3iMKG:XAk9uNfnX2p2Q5aIxL
TLSH
T1892413C4FF52EECEE8610AF03B4FA269DF715C6BC48202C114EA58535A65EB3F695B01
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2488-2-0x0000000000400000-0x0000000000499000-memory.dmp

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memory/2488-0-0x0000000000400000-0x0000000000499000-memory.dmp

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memory/3880-11-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/3880-10-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/3880-13-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/3880-15-0x0000000000930000-0x0000000000931000-memory.dmp

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memory/3880-16-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/3880-18-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/3880-21-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/4156-7-0x0000000000400000-0x0000000000499000-memory.dmp

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