farfli | 45e3a7e517f569669292f919ca79d6cdfed8be229f14e9c085d705d8fd0a2f29

Analysis

max time kernel
150s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20260513-en
resource tags

arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
03/06/2026, 22:43

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General

Target
2026-06-03_7bde19e357cd469995ca9f2e76e3c4b7_coinminer_elex_wannacry.exe
Size 299KB
Sample260603-2nekpse18v
SHA256 45e3a7e517f569669292f919ca79d6cdfed8be229f14e9c085d705d8fd0a2f29
MD5 7bde19e357cd469995ca9f2e76e3c4b7
SHA1 535ef000bfe8a6b52c449b602efc597a69b54315
SHA512 478b1153ed247eda6ac1188ca7f94cddf6bc0fdfb8353f5b29e89baccc874747ece5bd8733c294c965c14864eeac97bd6f78c504d3bc6343ae046c242522176b
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrO8:ywLcCmuErglr73aAD+p
TLSH
T12F64F182D501CF47FC2FCBB6823E1E251317AF562B205593D3C4BA1F65B2692A63E0D9
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 6 IoCs

resource	yara_rule
behavioral2/memory/3604-14-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/3604-11-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/3604-16-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/3604-18-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/3604-19-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/3604-20-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 6 IoCs

resource	yara_rule
behavioral2/memory/3604-14-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3604-11-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3604-16-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3604-18-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3604-19-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3604-20-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/1528-0-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral2/memory/1528-2-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral2/files/0x001f00000002b2a8-4.dat	UPX
behavioral2/memory/2252-7-0x0000000000400000-0x0000000000483000-memory.dmp	UPX

Badlisted process makes network request 9 IoCs

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

flow	pid	Process
1	3604	rundll32.exe
2	3604	rundll32.exe
3	3604	rundll32.exe
4	3604	rundll32.exe
5	3604	rundll32.exe
6	3604	rundll32.exe
7	3604	rundll32.exe
8	3604	rundll32.exe
11	3604	rundll32.exe

Deletes itself 1 IoCs

pid	Process
2252	btfeebl.exe

Executes dropped EXE 1 IoCs

pid	Process
2252	btfeebl.exe

Loads dropped DLL 1 IoCs

pid	Process
3604	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-1-5-21-2409539145-3342400454-2096821238-1000\Software\Microsoft\Windows\CurrentVersion\Run\Wetor = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\idrcdlnql\\lueczlaf.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)	\??\z:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	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/1528-0-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral2/memory/1528-2-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral2/files/0x001f00000002b2a8-4.dat	upx
behavioral2/memory/2252-7-0x0000000000400000-0x0000000000483000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\idrcdlnql	btfeebl.exe
File created	\??\c:\Program Files\idrcdlnql\lueczlaf.dll	btfeebl.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	2026-06-03_7bde19e357cd469995ca9f2e76e3c4b7_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	btfeebl.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
3788	PING.EXE
3720	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 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
3788	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3604	rundll32.exe
3604	rundll32.exe
3604	rundll32.exe
3604	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3604	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1528	2026-06-03_7bde19e357cd469995ca9f2e76e3c4b7_coinminer_elex_wannacry.exe
2252	btfeebl.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1528 wrote to memory of 3720	1528	2026-06-03_7bde19e357cd469995ca9f2e76e3c4b7_coinminer_elex_wannacry.exe	80
PID 3720 wrote to memory of 3788	3720	cmd.exe	82
PID 3720 wrote to memory of 2252	3720	cmd.exe	83
PID 2252 wrote to memory of 3604	2252	btfeebl.exe	84

C:\Users\Admin\AppData\Local\Temp\2026-06-03_7bde19e357cd469995ca9f2e76e3c4b7_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-03_7bde19e357cd469995ca9f2e76e3c4b7_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1528
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\btfeebl.exe "C:\Users\Admin\AppData\Local\Temp\2026-06-03_7bde19e357cd469995ca9f2e76e3c4b7_coinminer_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3720
- - 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:3788
- - C:\Users\Admin\AppData\Local\Temp\btfeebl.exe
    C:\Users\Admin\AppData\Local\Temp\\btfeebl.exe "C:\Users\Admin\AppData\Local\Temp\2026-06-03_7bde19e357cd469995ca9f2e76e3c4b7_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:2252
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\idrcdlnql\lueczlaf.dll",GetProc C:\Users\Admin\AppData\Local\Temp\btfeebl.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:3604

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

Replay Monitor

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Downloads

btfeebl.exe

Path C:\Users\Admin\AppData\Local\Temp\btfeebl.exe
Size 300KB
SHA256 c0a3a51f22375230cd2f3d83a116fb1f03a86677bc164d9a6c769a63f5ef1ade
MD5 04d76d01cd04a70a0fbdc052c102c68e
SHA1 9b174dfca9f47586f471c2a3d14c39d4bcdbac6d
SHA512 7b360bca5faeae2633b3e1d59c85e2a108aaf2f6d093870e9ddc4b6f719dbd737045c8e0908d9de498ba80ab857e3c5240be6c28da52e6e01c94c33456fda71c
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrO:ywLcCmuErglr73aAD+
TLSH
T1FB64F182D501CF47FC2FCBB6823E1E251317AF562B205593D3C4BA1F65B2692A63E0D9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

lueczlaf.dll

Path \??\c:\Program Files\idrcdlnql\lueczlaf.dll
Size 218KB
SHA256 ccf95258c331f08213cc3897a03548bd2e1b5df5bc1142261aa49d7882ca65fa
MD5 37839d94f4bf16584792010c84fc6721
SHA1 301fbbdba7c6ec5c7101fab38e4e8428c0afca0b
SHA512 828274fdcadf6dd37b0b6c38289ea5f3d1b104aa55b381f09507cbe99374ab8d257854bb1bd2f8dfdbdc2e46a9ba4539cd72bacdb4b402b3aa6f5d2ed6814437
SSDEEP 6144:KORxNwD2VOidhzeXwddDzLi5vOQEqscr0ZTJauytq:pnNwDTi3swddDiROXIk
TLSH
T18424128BCF983873C5223379597951A0BA3252909FA1534D93E6D34FA072BA2CF7B531
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1528-0-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/1528-2-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/2252-7-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/3604-14-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/3604-10-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/3604-13-0x0000000002360000-0x0000000002361000-memory.dmp

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memory/3604-11-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/3604-16-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/3604-18-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/3604-19-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/3604-20-0x0000000010000000-0x0000000010058000-memory.dmp

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