farfli | bcbe5f7a0e3384b91ad04aa77bac24229b556cd29cc6fd62048f284e4880d75c

Analysis

max time kernel
148s
max time network
138s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
05/11/2026, 11:29

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General

Target
2026-11-04_d280543be3b8ac83d147e281ca86f85b_elex_wannacry.exe
Size 405KB
Sample261105-nlwvbabz5m
SHA256 bcbe5f7a0e3384b91ad04aa77bac24229b556cd29cc6fd62048f284e4880d75c
MD5 d280543be3b8ac83d147e281ca86f85b
SHA1 ae5cdfde84501a9a19c9d9f4e44a6d05295afda6
SHA512 d2822105e34ed7cfed7fb10ddaf7fc544e850de54f16ab8ca3fe6e3dd18825debefb77caca2e0f68d90cd7b24b1dcd37d8701308ed4d880f226e2d1f2fb5ae4c
SSDEEP 6144:JtecHBTSpjVfs3mCL17O/cvARZZWcStoWwABr8iXpXxr2kDQH/9Mm:nHBTwjBqbYkvqZMcV7i32ieb
TLSH
T1C194DF2332C0C8B7C1913373FEE6A672E3F5C2A85D356B7753D9024D1E2794C92562A9
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 6 IoCs

resource	yara_rule
behavioral2/memory/2560-12-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/2560-14-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/2560-10-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/2560-16-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/2560-18-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli
behavioral2/memory/2560-21-0x0000000010000000-0x000000001005A000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 6 IoCs

resource	yara_rule
behavioral2/memory/2560-12-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2560-14-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2560-10-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2560-16-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2560-18-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2560-21-0x0000000010000000-0x000000001005A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
2120	tyqxi.exe

Executes dropped EXE 2 IoCs

pid	Process
2120	tyqxi.exe
2560	yzh.exe

Loads dropped DLL 1 IoCs

pid	Process
2560	yzh.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-1-5-21-2304238888-3968896904-642854331-1000\Software\Microsoft\Windows\CurrentVersion\Run\DESIME = "c:\\Program Files\\pptqb\\yzh.exe \"c:\\Program Files\\pptqb\\yzhkk.dll\",DoPrivacy"	yzh.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)	\??\g:	yzh.exe
File opened (read-only)	\??\j:	yzh.exe
File opened (read-only)	\??\t:	yzh.exe
File opened (read-only)	\??\x:	yzh.exe
File opened (read-only)	\??\y:	yzh.exe
File opened (read-only)	\??\b:	yzh.exe
File opened (read-only)	\??\d:	yzh.exe
File opened (read-only)	\??\p:	yzh.exe
File opened (read-only)	\??\z:	yzh.exe
File opened (read-only)	\??\a:	yzh.exe
File opened (read-only)	\??\m:	yzh.exe
File opened (read-only)	\??\n:	yzh.exe
File opened (read-only)	\??\q:	yzh.exe
File opened (read-only)	\??\s:	yzh.exe
File opened (read-only)	\??\w:	yzh.exe
File opened (read-only)	\??\h:	yzh.exe
File opened (read-only)	\??\i:	yzh.exe
File opened (read-only)	\??\k:	yzh.exe
File opened (read-only)	\??\l:	yzh.exe
File opened (read-only)	\??\o:	yzh.exe
File opened (read-only)	\??\r:	yzh.exe
File opened (read-only)	\??\u:	yzh.exe
File opened (read-only)	\??\v:	yzh.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	yzh.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4592-0-0x0000000000400000-0x0000000000499000-memory.dmp	upx
behavioral2/memory/4592-2-0x0000000000400000-0x0000000000499000-memory.dmp	upx
behavioral2/files/0x000e000000016d03-3.dat	upx
behavioral2/memory/2120-7-0x0000000000400000-0x0000000000499000-memory.dmp	upx

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\pptqb	tyqxi.exe
File created	\??\c:\Program Files\pptqb\yzhkk.dll	tyqxi.exe
File created	\??\c:\Program Files\pptqb\yzh.exe	tyqxi.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
3164	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 1 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	yzh.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	tyqxi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yzh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-04_d280543be3b8ac83d147e281ca86f85b_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

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
3164	cmd.exe
4140	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	yzh.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	yzh.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4140	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2560	yzh.exe
2560	yzh.exe
2560	yzh.exe
2560	yzh.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2560	yzh.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4592	2026-11-04_d280543be3b8ac83d147e281ca86f85b_elex_wannacry.exe
2120	tyqxi.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4592 wrote to memory of 3164	4592	2026-11-04_d280543be3b8ac83d147e281ca86f85b_elex_wannacry.exe	89
PID 3164 wrote to memory of 4140	3164	cmd.exe	91
PID 3164 wrote to memory of 2120	3164	cmd.exe	92
PID 2120 wrote to memory of 2560	2120	tyqxi.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-11-04_d280543be3b8ac83d147e281ca86f85b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-04_d280543be3b8ac83d147e281ca86f85b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4592
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\tyqxi.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-04_d280543be3b8ac83d147e281ca86f85b_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:3164
- - 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:4140
- - C:\Users\Admin\AppData\Local\Temp\tyqxi.exe
    C:\Users\Admin\AppData\Local\Temp\\tyqxi.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-04_d280543be3b8ac83d147e281ca86f85b_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:2120
  - - \??\c:\Program Files\pptqb\yzh.exe
      "c:\Program Files\pptqb\yzh.exe" "c:\Program Files\pptqb\yzhkk.dll",DoPrivacy C:\Users\Admin\AppData\Local\Temp\tyqxi.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2560

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

yzh.exe

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

Submit Download

tyqxi.exe

Path C:\Users\Admin\AppData\Local\Temp\tyqxi.exe
Size 405KB
SHA256 b06b0f6df9c172de4a419180c989f1eccf074c13cf292aee9c1da539720abc73
MD5 6b334b50c862b04cbfeb62867d16144f
SHA1 8b96064a51750a2ceda9d97fe64e2ed66e32fff5
SHA512 312952c7b722186e307cb9d49a501adde54305e153eeb84aca75ac848701894cd7b14334267d9fdcf093a1a1234a24fe5dc133c0ce240e824482141393aeea20
SSDEEP 6144:JtecHBTSpjVfs3mCL17O/cvARZZWcStoWwABr8iXpXxr2kDQH/9M:nHBTwjBqbYkvqZMcV7i32ie
TLSH
T1C794DF2332C0C8B7C1913373FEE6A672E3F5C2A85D356B7753DA024D1E2794C92562A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

yzhkk.dll

Path \??\c:\Program Files\pptqb\yzhkk.dll
Size 219KB
SHA256 b62a45f6c0a362f776743e6d23dda53d707e9e8ee3d6a71245d912f0f38a4f73
MD5 bbed18251f4b3b31342496b646cdf4bf
SHA1 ecd6c5cff775a8b788dd2a37ba7df9776475ec6b
SHA512 9f5f8736bf87bac4f16a6ab82cbac7657b5b7039fc7e1c4290069af0d6225292f4b40d1c3f745d80bcd62e8f606e820900766e2fe19036340f900b34a268097f
SSDEEP 6144:XxDink0qeQKc/A8MNfnX2p2KL5aI3iMKN:XAk9uNfnX2p2Q5aIxu
TLSH
T1852413D0FF52EECEE8610AF03B4FA269DF705C6BC48202C114EE58535A65EA3F695705
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2120-7-0x0000000000400000-0x0000000000499000-memory.dmp

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memory/2560-12-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/2560-15-0x00000000006D0000-0x00000000006D1000-memory.dmp

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memory/2560-14-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/2560-10-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/2560-16-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/2560-18-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/2560-21-0x0000000010000000-0x000000001005A000-memory.dmp

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memory/4592-2-0x0000000000400000-0x0000000000499000-memory.dmp

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memory/4592-0-0x0000000000400000-0x0000000000499000-memory.dmp

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