farfli | b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76

General

Target
b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76.exe
Size 104KB
Sample260710-ml9kqsax51
SHA256 b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76
MD5 b924485fafdb1b1f51311f12742544c1
SHA1 035fad2bf8ec9fd107c75fb9eaf0d0af0531491b
SHA512 8af269e93075978c7b4f7649aa2570823978b379b9d88f0deb7b9b5a2dd21fc86b3fd1517ff2106dc6192ef776ff108ac8933e934eb92c0a78e1fa087ff375ef
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX47dq:piAXaKDeKNnD36cb8tI7o
TLSH
T1D0A3AE42ABF087A1E06159B506735B629EB3FC2B2934822777D7B70EAC30F40EE25355
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery farfli persistence spyware stealer

Malware Config

Signatures

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

Detects Farfli Backdoor 1 IoCs

resource	yara_rule
behavioral2/memory/4764-10-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
1	4764	rundll32.exe
2	4764	rundll32.exe
3	4764	rundll32.exe
6	4764	rundll32.exe
7	4764	rundll32.exe
8	4764	rundll32.exe
9	4764	rundll32.exe
10	4764	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3220	jgcvduxhj.exe

Executes dropped EXE 1 IoCs

pid	Process
3220	jgcvduxhj.exe

Loads dropped DLL 1 IoCs

pid	Process
4764	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-1-5-21-1738198120-2966725515-3980530802-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\ycews\\tenxe.dll\",GetWindowClass"	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)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\k:	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)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	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

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	b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76.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	jgcvduxhj.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
4088	cmd.exe
4884	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
4884	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4764	rundll32.exe
4764	rundll32.exe
4764	rundll32.exe
4764	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4764	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2012	b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76.exe
3220	jgcvduxhj.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2012 wrote to memory of 4088	2012	b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76.exe	87
PID 4088 wrote to memory of 4884	4088	cmd.exe	89
PID 4088 wrote to memory of 3220	4088	cmd.exe	90
PID 3220 wrote to memory of 4764	3220	jgcvduxhj.exe	91

C:\Users\Admin\AppData\Local\Temp\b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76.exe
"C:\Users\Admin\AppData\Local\Temp\b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2012
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\jgcvduxhj.exe "C:\Users\Admin\AppData\Local\Temp\b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4088
- - 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:4884
- - \??\c:\jgcvduxhj.exe
    c:\jgcvduxhj.exe "C:\Users\Admin\AppData\Local\Temp\b16539cccb340de15131c94cf3555ba64b0d46cec741184014cd77405f598e76.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3220
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\ycews\tenxe.dll",GetWindowClass c:\jgcvduxhj.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:4764

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

jgcvduxhj.exe

Path \??\c:\jgcvduxhj.exe
Size 104KB
SHA256 340b6325424ad9705e9a16fa5f5c52eadcc06b35c1d5921fbf25903c4129642b
MD5 41e09c61b32e74bad5631cd6d57b3fdd
SHA1 ee235e625ee4195cf8793ba28d3b138f0d3dd793
SHA512 ec32dda0b53dfa13f6e0b80d36e1025988742bfe5afaa6f1fc7df01af8f929947bc27be618ca86f873f790f82769e720adf7b15b74272f4f1449f6e487c07ad9
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX47dq+:piAXaKDeKNnD36cb8tI7o+
TLSH
T108A3AE42ABF087A1E0615DB506735B629EB3FC2B2934862777D6B70EAC30F40EE25355
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

tenxe.dll

Path \??\c:\ycews\tenxe.dll
Size 46KB
SHA256 f57f9e54f4774c2b944fb070ae0c2a02cbb4b7686ab3207544c3ccaff0ff3dd9
MD5 a3fd41430ddcaa55fde840788925406a
SHA1 dbdd87f5c1bbf6a6f44c2e2c4744675d5e4e75c2
SHA512 23109572cfc9a282ea3ec84d93bfe02303d27f365ad2d9f47f6234f91da14c64f80133cc5e49746dfcb65d2454b7e7c13eff59ba4bbc18e09d2fb1c630ba59c9
SSDEEP 768:2sUfnvxs6iLlhpfFPtnQf7kifD/v7yb9Bh7Cb0VQJojZC/xjTk:2sJT1qf4W/vub9nnV1jZC/xE
TLSH
T19D2302C8A6F08EF3D2F90B7980E046DCDCFDB939877381150566008E7C71057FA446AA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2012-0-0x0000000000400000-0x000000000041A000-memory.dmp

Download

memory/2012-2-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/3220-6-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/4764-9-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4764-10-0x0000000010000000-0x000000001002E000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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