farfli | 4f5c3fb3fb457accc66902e31c78c7d790f8cda7c3c52de522f946e783cca3eb

General

Target
2026-08-09_f9e5e92674e8d9336624ca1ccecf6aa3_elex_wannacry.exe
Size 133KB
Sample260809-g4f39aap5v
SHA256 4f5c3fb3fb457accc66902e31c78c7d790f8cda7c3c52de522f946e783cca3eb
MD5 f9e5e92674e8d9336624ca1ccecf6aa3
SHA1 e025ed969a1d4c88f99d4ee330f51d35f21911ad
SHA512 9f1320f837a05228289faf6e89ab82bbf3112ec52b583d362a426d1801502e87de2bfef05b3a585f89d496f8d895f03821c8176ab7d249380b5d07956e78cf6c
SSDEEP 1536:C/6EkrKHqgGFs5/Z6s7H3dPT+X/O3DX6HZ9am1AEgHZ5bdpDvkDBlxZP1n:CSKPRdPe/Oz67aKVgbbdpDcljZ9n
TLSH
T123D3BF527A6585F0E01645331397AB3286B1DC5E7A1803FE93C8EF0FBD657219CBB298
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 2 IoCs

resource	yara_rule
behavioral2/memory/5996-9-0x0000000010000000-0x0000000010030000-memory.dmp	family_farfli
behavioral2/memory/5996-10-0x0000000010000000-0x0000000010030000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/5996-9-0x0000000010000000-0x0000000010030000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5996-10-0x0000000010000000-0x0000000010030000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
4	5996	rundll32.exe
5	5996	rundll32.exe
6	5996	rundll32.exe
10	5996	rundll32.exe
11	5996	rundll32.exe
15	5996	rundll32.exe
17	5996	rundll32.exe
19	5996	rundll32.exe

Deletes itself 1 IoCs

pid	Process
6512	swids.exe

Executes dropped EXE 1 IoCs

pid	Process
6512	swids.exe

Loads dropped DLL 1 IoCs

pid	Process
5996	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-1-5-21-1014449518-1831897916-4205727055-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\ewwpibdg\\bdrbswy.dll\",QueryPluginInterface"	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)	\??\o:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	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/6808-0-0x0000000000400000-0x000000000041E000-memory.dmp	upx
behavioral2/memory/6808-2-0x0000000000400000-0x000000000041E000-memory.dmp	upx
behavioral2/files/0x001200000001157e-3.dat	upx
behavioral2/memory/6512-6-0x0000000000400000-0x000000000041E000-memory.dmp	upx

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
1852	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	swids.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_f9e5e92674e8d9336624ca1ccecf6aa3_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
1852	cmd.exe
6496	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
6496	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5996	rundll32.exe
5996	rundll32.exe
5996	rundll32.exe
5996	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5996	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
6808	2026-08-09_f9e5e92674e8d9336624ca1ccecf6aa3_elex_wannacry.exe
6512	swids.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 6808 wrote to memory of 1852	6808	2026-08-09_f9e5e92674e8d9336624ca1ccecf6aa3_elex_wannacry.exe	90
PID 1852 wrote to memory of 6496	1852	cmd.exe	92
PID 1852 wrote to memory of 6512	1852	cmd.exe	93
PID 6512 wrote to memory of 5996	6512	swids.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-09_f9e5e92674e8d9336624ca1ccecf6aa3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_f9e5e92674e8d9336624ca1ccecf6aa3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:6808
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\swids.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-09_f9e5e92674e8d9336624ca1ccecf6aa3_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:1852
- - 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:6496
- - C:\Users\Admin\AppData\Local\Temp\swids.exe
    C:\Users\Admin\AppData\Local\Temp\\swids.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-09_f9e5e92674e8d9336624ca1ccecf6aa3_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:6512
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\ewwpibdg\bdrbswy.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\swids.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:5996

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

swids.exe

Path C:\Users\Admin\AppData\Local\Temp\swids.exe
Size 133KB
SHA256 55309675e9a9e0b74d097d5073d9e37f29a5ddcb33f1f801abde4dc609494679
MD5 b7d1dea7cb54a23ac48902cda84d574e
SHA1 77556bb7e50d1a795e76832520f6a8d80b3ca62e
SHA512 355604ced2711bff9a5ed40d303996779dac895ac2b621b6eb9bb31f42fb63dbbbfc7ec9411b62a7456d11076a2a61cd25ee92cdf24f2c2f3f11f90fa5c3883d
SSDEEP 1536:C/6EkrKHqgGFs5/Z6s7H3dPT+X/O3DX6HZ9am1AEgHZ5bdpDvkDBlxZP1nh:CSKPRdPe/Oz67aKVgbbdpDcljZ9nh
TLSH
T1E3D3BF527A6585F0E01645331397AB3286B1DC5E7A1803FE93C8EF0FBD657219CBB298
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

bdrbswy.dll

Path \??\c:\ewwpibdg\bdrbswy.dll
Size 59KB
SHA256 12264670242948b129acc4d9cd80cdf83fac88e662c09a57ce5ac6b39510618d
MD5 8552951ec6ab253e038ffc809235b08c
SHA1 c59e347bfebd96c0e4b60a0d33b5923fb137af55
SHA512 17864dfff89f397c647ec02926cfd639e33a05061cb6164756afd3d8c4e24281cba9c4770d16927ba56e1e02a139faf970748bfe07454f4528eab9f87e2c0cd9
SSDEEP 1536:x0u5H+DyujZ2uoHzCf/IYmRGMJnc7Z4ch:x04eDyY/oH8SIMJncNnh
TLSH
T12843F21CE351855BDAAB0672678F6F407A238A7F5B32485A914C2454BF3BE77C937380
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5996-9-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/5996-10-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/6512-6-0x0000000000400000-0x000000000041E000-memory.dmp

Download

memory/6808-0-0x0000000000400000-0x000000000041E000-memory.dmp

Download

memory/6808-2-0x0000000000400000-0x000000000041E000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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