farfli | 7515dfce9b66c6938024f7f7400137d64891df826e9eb6cd079df78313cdf35b

General

Target
2026-04-15_795bedaad36208d7c1219c856a70f2de_elex_wannacry.exe
Size 136KB
Sample260415-2ap5aadv81
SHA256 7515dfce9b66c6938024f7f7400137d64891df826e9eb6cd079df78313cdf35b
MD5 795bedaad36208d7c1219c856a70f2de
SHA1 593b9eaf5201c4f9fe0740000187a9516f7e08ab
SHA512 e6e9b4532b41231d2203c25d7a75867b637bf85c466158b70ea041f133d7639e8eedbc8147ffe9bcade230a54ba8330cb46caf3147b1588f6c54110880896d13
SSDEEP 1536:f/6EkrKHqgGFs5N6s7H3dPT+X/O3DX6HZ9am1AEgHZ5bdpDvkDBlxZP1n/:fSKP3Pe/Oz67aKVgbbdpDcljZ9n/
TLSH
T113D3AF527A6085F0E01645331397AB318671DC5E3A1813EE93C8EF0FBD65B25ECBB298
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 2 IoCs

resource	yara_rule
behavioral1/memory/4520-10-0x0000000010000000-0x0000000010030000-memory.dmp	family_farfli
behavioral1/memory/4520-12-0x0000000010000000-0x0000000010030000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral1/memory/4520-10-0x0000000010000000-0x0000000010030000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4520-12-0x0000000010000000-0x0000000010030000-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
12	4520	rundll32.exe
14	4520	rundll32.exe
13	4520	rundll32.exe
15	4520	rundll32.exe
25	4520	rundll32.exe
31	4520	rundll32.exe
39	4520	rundll32.exe
49	4520	rundll32.exe

Deletes itself 1 IoCs

pid	Process
6008	iizww.exe

Executes dropped EXE 1 IoCs

pid	Process
6008	iizww.exe

Loads dropped DLL 1 IoCs

pid	Process
4520	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-1-5-21-721190819-434563495-2007910846-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\qejus\\xbsrbaaw.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)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	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)	\??\l:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\q:	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)	\??\y:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	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
behavioral1/memory/4324-0-0x0000000000400000-0x000000000041E000-memory.dmp	upx
behavioral1/memory/4324-2-0x0000000000400000-0x000000000041E000-memory.dmp	upx
behavioral1/files/0x0008000000024404-4.dat	upx
behavioral1/memory/6008-7-0x0000000000400000-0x000000000041E000-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_795bedaad36208d7c1219c856a70f2de_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	iizww.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
4444	cmd.exe
4420	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
4420	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4520	rundll32.exe
4520	rundll32.exe
4520	rundll32.exe
4520	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4520	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4324	2026-04-15_795bedaad36208d7c1219c856a70f2de_elex_wannacry.exe
6008	iizww.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4324 wrote to memory of 4444	4324	2026-04-15_795bedaad36208d7c1219c856a70f2de_elex_wannacry.exe	83
PID 4444 wrote to memory of 4420	4444	cmd.exe	85
PID 4444 wrote to memory of 6008	4444	cmd.exe	87
PID 6008 wrote to memory of 4520	6008	iizww.exe	88

C:\Users\Admin\AppData\Local\Temp\2026-04-15_795bedaad36208d7c1219c856a70f2de_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_795bedaad36208d7c1219c856a70f2de_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4324
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\iizww.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-15_795bedaad36208d7c1219c856a70f2de_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4444
- - 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:4420
- - C:\Users\Admin\AppData\Local\Temp\iizww.exe
    C:\Users\Admin\AppData\Local\Temp\\iizww.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-15_795bedaad36208d7c1219c856a70f2de_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:6008
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\qejus\xbsrbaaw.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\iizww.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:4520

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

iizww.exe

Path C:\Users\Admin\AppData\Local\Temp\iizww.exe
Size 136KB
SHA256 50059c425418c04d7ccf10fd337ea17b01370f925e4b490e0d85308489e352b6
MD5 68336465a2354645579d9eee37823aaf
SHA1 fb786a84e178ffa9847643ec5040d9ae82bc4228
SHA512 89fdeabe8bbaa2406393a4a165e0e8b608f6cd787c086f31056e04c42664851a4a26bd5762471ddaf17fa85aea520a25446b80eb9ac5145043a7dbc89ca29457
SSDEEP 1536:f/6EkrKHqgGFs5N6s7H3dPT+X/O3DX6HZ9am1AEgHZ5bdpDvkDBlxZP1nX:fSKP3Pe/Oz67aKVgbbdpDcljZ9nX
TLSH
T18CD3AF527A6085F0E01655331397AB318671DC5E3A1813EE93C8EF0FBD65B25ECBB298
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

xbsrbaaw.dll

Path \??\c:\qejus\xbsrbaaw.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/4324-0-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4324-2-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4520-10-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/4520-11-0x00000000030F0000-0x000000000314F000-memory.dmp

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memory/4520-12-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/6008-7-0x0000000000400000-0x000000000041E000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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