farfli | f5f1d2ed67f30256c3313d777de216ac6bebbd1be00e17c4378daa1285eaa513

Analysis

max time kernel
148s
max time network
150s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
10/08/2026, 10:24

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General

Target
2026-08-10_6c14243cb2d802d341970346b86b1d9e_coinminer_elex_wannacry.exe
Size 296KB
Sample260810-mfsd9sfe35
SHA256 f5f1d2ed67f30256c3313d777de216ac6bebbd1be00e17c4378daa1285eaa513
MD5 6c14243cb2d802d341970346b86b1d9e
SHA1 fc159ae6d241b1106582e40c604372f16576ca5e
SHA512 2cef220145e2021d62e7f817e9081cb7a4fde488fb12c4bff48063bcd9ae4ac2be3f3c9a294588d97266fa501453db45bb2f4601ce0e2de46321913c55bcd033
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrOC:ywLcCmuErglr73aAD+Z
TLSH
T128540282E501DF07EC2FC7B6813E5E291217AF621B705597D3C0B91E26B3682B63A0DD
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 7 IoCs

resource	yara_rule
behavioral2/memory/680-10-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/680-12-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/680-15-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/680-17-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/680-18-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/680-19-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/680-20-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 7 IoCs

resource	yara_rule
behavioral2/memory/680-10-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/680-12-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/680-15-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/680-17-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/680-18-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/680-19-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/680-20-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/3412-0-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral2/memory/3412-2-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral2/files/0x000a000000019cb8-3.dat	UPX
behavioral2/memory/248-6-0x0000000000400000-0x0000000000483000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
3	680	rundll32.exe
9	680	rundll32.exe
10	680	rundll32.exe
11	680	rundll32.exe
12	680	rundll32.exe
14	680	rundll32.exe
15	680	rundll32.exe
16	680	rundll32.exe

Deletes itself 1 IoCs

pid	Process
248	vsvgsbrt.exe

Executes dropped EXE 1 IoCs

pid	Process
248	vsvgsbrt.exe

Loads dropped DLL 1 IoCs

pid	Process
680	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-1-5-21-3797332335-34111092-3597280141-1000\Software\Microsoft\Windows\CurrentVersion\Run\Wetor = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\wwsxc\\xsiuovf.dll\",GetProc"	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)	\??\h:	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)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\w:	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/3412-0-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral2/memory/3412-2-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral2/files/0x000a000000019cb8-3.dat	upx
behavioral2/memory/248-6-0x0000000000400000-0x0000000000483000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	\??\c:\Program Files\wwsxc\xsiuovf.dll	vsvgsbrt.exe
File opened for modification	\??\c:\Program Files\wwsxc	vsvgsbrt.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
5116	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	2026-08-10_6c14243cb2d802d341970346b86b1d9e_coinminer_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	vsvgsbrt.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
5116	cmd.exe
3588	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
3588	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
680	rundll32.exe
680	rundll32.exe
680	rundll32.exe
680	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	680	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3412	2026-08-10_6c14243cb2d802d341970346b86b1d9e_coinminer_elex_wannacry.exe
248	vsvgsbrt.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3412 wrote to memory of 5116	3412	2026-08-10_6c14243cb2d802d341970346b86b1d9e_coinminer_elex_wannacry.exe	89
PID 5116 wrote to memory of 3588	5116	cmd.exe	91
PID 5116 wrote to memory of 248	5116	cmd.exe	92
PID 248 wrote to memory of 680	248	vsvgsbrt.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-10_6c14243cb2d802d341970346b86b1d9e_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_6c14243cb2d802d341970346b86b1d9e_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3412
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\vsvgsbrt.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-10_6c14243cb2d802d341970346b86b1d9e_coinminer_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:5116
- - 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:3588
- - C:\Users\Admin\AppData\Local\Temp\vsvgsbrt.exe
    C:\Users\Admin\AppData\Local\Temp\\vsvgsbrt.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-10_6c14243cb2d802d341970346b86b1d9e_coinminer_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:248
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\wwsxc\xsiuovf.dll",GetProc C:\Users\Admin\AppData\Local\Temp\vsvgsbrt.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:680

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

vsvgsbrt.exe

Path C:\Users\Admin\AppData\Local\Temp\vsvgsbrt.exe
Size 296KB
SHA256 5367bee2efcb4750c16790c503d016961dd31ef060c9a01deae14cb6e02e5a7c
MD5 8261a1929ecff044dd9c8e5bd80e5b52
SHA1 50fcc224a6ef4214182c2d398758d8349bfdbe01
SHA512 b73f85174ad638b3473b8be4425d16b368cdaac1195034494ab7f734518ba6866584c4ec9af3cd19b88328e22ee9368f762601517f05fe30c70559577513c27c
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrOT:ywLcCmuErglr73aAD+4
TLSH
T1F6540282E501DF07EC2FC7B6813E5E291217AF621B705597D3C4B91E26B3682B63A0DD
MD5 SHA1 SHA512 SSDEEP TLSH

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xsiuovf.dll

Path \??\c:\Program Files\wwsxc\xsiuovf.dll
Size 218KB
SHA256 699670c3388dc01d64ffd46bd7990b9fc6591cdf567e78d341b2c2a1aefb8b2f
MD5 a91e155f7932d2a6d49aa2890593da97
SHA1 1261ebea86eeadbe01b99ec6521c86e985ddd2b7
SHA512 bf1ea6d0bcb2bbc247aa61aaa9f71dbbe57afe9dbecd50a0b98d88ddb6a89d3c4f2280a84b3cbf58047b67ed01e9522a9b150d4f9ae437361fd542eb9b3921e7
SSDEEP 6144:KORxNwD2VOidhzeXwddDzLi5vOQEqscr0ZTJauyti:pnNwDTi3swddDiROXIc
TLSH
T16924128BCF983873C5223379597951A0B9725290AFA1530D92E6D34FA072BA2CF7B531
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/248-6-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/680-10-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/680-9-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/680-14-0x00000000010E0000-0x00000000010E1000-memory.dmp

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memory/680-12-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/680-15-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/680-17-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/680-18-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/680-19-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/680-20-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/3412-2-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/3412-0-0x0000000000400000-0x0000000000483000-memory.dmp

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