farfli | 6e459bf1c76251495ee3924d0adcf5b62f559252ff0da8c055b5f7f9c571e777

Analysis

max time kernel
149s
max time network
138s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
15/04/2026, 17:16

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General

Target
2026-04-15_c75a750372b5d7766273a2b1be3bd1e5_coinminer_elex_wannacry.exe
Size 151KB
Sample260415-vtedkae18l
SHA256 6e459bf1c76251495ee3924d0adcf5b62f559252ff0da8c055b5f7f9c571e777
MD5 c75a750372b5d7766273a2b1be3bd1e5
SHA1 ff14968f1aa7cdcf06cdd8897e5055923fbfce1e
SHA512 c347db324480ab614f5ce365035019a831f46d63b723e35d77380e3e8adb84bc80084806a4619d2fedf9880f4db2eb5f86ede55b469caa2ad6f1d7d43e346efd
SSDEEP 1536:B3aacz2htqkUla/NGVcJ/gAqcX0JMseuiGSeNVvDi0tMuUJJny3GM+9qKv:Ua/qc9rqzMseNoVv9EJFnM8qKv
TLSH
T1CDE3270267F6C194F0B31E30DA3646F08BA6BC69FA70921B17847E4EBD31A15ED21776
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery farfli persistence spyware stealer upx

Malware Config

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli

Detects Farfli Backdoor 3 IoCs

resource	yara_rule
behavioral2/memory/3188-11-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/3188-13-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/3188-12-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 1 IoCs

resource	yara_rule
behavioral2/memory/3188-12-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/4836-0-0x0000000000400000-0x0000000000423000-memory.dmp	UPX
behavioral2/memory/4836-2-0x0000000000400000-0x0000000000423000-memory.dmp	UPX
behavioral2/files/0x001d00000002b2a0-4.dat	UPX
behavioral2/memory/1212-7-0x0000000000400000-0x0000000000423000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
1	3188	rundll32.exe
2	3188	rundll32.exe
4	3188	rundll32.exe
5	3188	rundll32.exe
6	3188	rundll32.exe
7	3188	rundll32.exe
8	3188	rundll32.exe
11	3188	rundll32.exe

Deletes itself 1 IoCs

pid	Process
1212	nvltu.exe

Executes dropped EXE 1 IoCs

pid	Process
1212	nvltu.exe

Loads dropped DLL 1 IoCs

pid	Process
3188	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-1-5-21-2122505878-652277452-2375749442-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\wgvgm\\yctkutag.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)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	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)	\??\n:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\p:	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/4836-0-0x0000000000400000-0x0000000000423000-memory.dmp	upx
behavioral2/memory/4836-2-0x0000000000400000-0x0000000000423000-memory.dmp	upx
behavioral2/files/0x001d00000002b2a0-4.dat	upx
behavioral2/memory/1212-7-0x0000000000400000-0x0000000000423000-memory.dmp	upx

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	2026-04-15_c75a750372b5d7766273a2b1be3bd1e5_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	nvltu.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
1892	cmd.exe
2116	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
2116	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3188	rundll32.exe
3188	rundll32.exe
3188	rundll32.exe
3188	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3188	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4836	2026-04-15_c75a750372b5d7766273a2b1be3bd1e5_coinminer_elex_wannacry.exe
1212	nvltu.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 1892	4836	2026-04-15_c75a750372b5d7766273a2b1be3bd1e5_coinminer_elex_wannacry.exe	80
PID 1892 wrote to memory of 2116	1892	cmd.exe	82
PID 1892 wrote to memory of 1212	1892	cmd.exe	83
PID 1212 wrote to memory of 3188	1212	nvltu.exe	84

C:\Users\Admin\AppData\Local\Temp\2026-04-15_c75a750372b5d7766273a2b1be3bd1e5_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_c75a750372b5d7766273a2b1be3bd1e5_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4836
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\nvltu.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-15_c75a750372b5d7766273a2b1be3bd1e5_coinminer_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1892
- - 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:2116
- - \??\c:\nvltu.exe
    c:\nvltu.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-15_c75a750372b5d7766273a2b1be3bd1e5_coinminer_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1212
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\wgvgm\yctkutag.dll",init c:\nvltu.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:3188

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

nvltu.exe

Path C:\nvltu.exe
Size 151KB
SHA256 1576734c461f011932fabdd5b2425e373dc0642da5a66dec237ba6b642be3122
MD5 cdbc1f95d3a35b959886712669eab516
SHA1 374f02875047bf7da0c16cfc8a74841f22392128
SHA512 319372f84ac8a3e01912f620c6c011b156364b550767633733de0ffddd2c6b08d967edff0b27a565552554475225b83a6fbcb63da7c0a9f1b48da841210bec08
SSDEEP 1536:B3aacz2htqkUla/NGVcJ/gAqcX0JMseuiGSeNVvDi0tMuUJJny3GM+9qKvX:Ua/qc9rqzMseNoVv9EJFnM8qKvX
TLSH
T1B8E3270267F6C194F0B31E30DA3646F08BA6BC69FA70921B17847E4EBD31A15ED21776
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

yctkutag.dll

Path \??\c:\wgvgm\yctkutag.dll
Size 50KB
SHA256 a632527bcd457c9a4cfce83e7a9a675baff790b0279de5d8ea3192dfb2dd888a
MD5 ab32c5bfd7ecfbe9ed733dfb81210933
SHA1 4d5c6e7a0031691f12e78b096ff928b0d55bdfab
SHA512 59b971146292074d76d23d5f26889108f4d6e33804332449f4c589bf8a8d53e37ac8dfea47e9d3c5ae0f382ae1acf25c4968bea87b3f5ff9d51f2274229c1ab5
SSDEEP 1536:mrrG57ZqLLpf+Xz+HOtygmRnO/x5Rq8Gm:mwKGqutWM/x281
TLSH
T12033F1F4EFB4E067ECBA5F743E6A6215DA727B10C63188EA518090135F335CACA18717
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1212-7-0x0000000000400000-0x0000000000423000-memory.dmp

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memory/3188-11-0x0000000010001000-0x0000000010021000-memory.dmp

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memory/3188-10-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/3188-13-0x0000000010001000-0x0000000010021000-memory.dmp

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memory/3188-12-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/3188-14-0x0000000000DB0000-0x0000000000DCA000-memory.dmp

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memory/3188-15-0x0000000002A00000-0x0000000002A07000-memory.dmp

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memory/4836-0-0x0000000000400000-0x0000000000423000-memory.dmp

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memory/4836-2-0x0000000000400000-0x0000000000423000-memory.dmp

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