floxif | 778541a97e25815320658acbdc64abfe8904bb51ceaa90e49c044b48c925f017

Analysis

max time kernel
99s
max time network
121s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
16/08/2024, 01:24

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General

Target
02507669f1e19b8d189b41c37d6eabd0N.dll
Size 301KB
Sample240816-bsdk4axcqc
SHA256 778541a97e25815320658acbdc64abfe8904bb51ceaa90e49c044b48c925f017
MD5 02507669f1e19b8d189b41c37d6eabd0
SHA1 6b3d6cb6704190c3206369507313a12fbae85a76
SHA512 50a3f87a7245039b291e59b58a0bff1e0247d1b1461720a69d8de9a134687c5aef22c00f0ae2b813f0794c1f75ab0ab5ed10cbdce8f7c06ab4987c83dee6e6ba
SSDEEP 6144:ZIIII396mCObwFd8nhbr9+3Ig5wqRbOwHO4BV+UdvrEFp7hKC93:pCObwDQT+4g5wmu4BjvrEH7393
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

floxif backdoor discovery persistence trojan upx

Malware Config

Signatures

Floxif, Floodfix
Floxif aka FloodFix is a file-changing trojan and backdoor written in C++.
backdoor trojan floxif

Detects Floxif payload 1 IoCs

backdoor

resource	yara_rule
behavioral2/files/0x0008000000023468-3.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x0008000000023468-3.dat	acprotect

Loads dropped DLL 2 IoCs

pid	Process
2064	regsvr32.exe
2064	regsvr32.exe

Modifies system executable filetype association 2 TTPs 3 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shellex\ContextMenuHandlers	regsvr32.exe

UPX packed file 3 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x0008000000023468-3.dat	upx
behavioral2/memory/2064-5-0x0000000002670000-0x00000000026A0000-memory.dmp	upx
behavioral2/memory/2064-11-0x0000000002670000-0x00000000026A0000-memory.dmp	upx

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	regsvr32.exe

System Location Discovery: System Language Discovery 1 TTPs 1 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	regsvr32.exe

Modifies registry class 38 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\DragDropHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\InternetShortcut\ShellEx\ContextMenuHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}\InProcServer32\ThreadingModel = "Apartment"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\DragDropHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\background\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\shellex\DragDropHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Drive\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}\ = "FastCopy"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\Background\shellex\ContextMenuHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\shellex\DragDropHandlers\FastCopy	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\InternetShortcut\shellex\ContextMenuHandlers	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}\InProcServer32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Drive\shellex\DragDropHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\shellex\ContextMenuHandlers	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\shellex\DragDropHandlers\FastCopy	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\shellex\DragDropHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Drive\shellex\DragDropHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Drive\shellex\DragDropHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\DragDropHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\shellex\ContextMenuHandlers	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\shellex\DragDropHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\shellex\DragDropHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\background\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Drive\shellex\ContextMenuHandlers	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shellex\ContextMenuHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Drive\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\InternetShortcut\ShellEx\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\02507669f1e19b8d189b41c37d6eabd0N.dll"	regsvr32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2228 wrote to memory of 2064	2228	regsvr32.exe	87
PID 2228 wrote to memory of 2064	2228	regsvr32.exe	87
PID 2228 wrote to memory of 2064	2228	regsvr32.exe	87

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\02507669f1e19b8d189b41c37d6eabd0N.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:2228
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\02507669f1e19b8d189b41c37d6eabd0N.dll
  2⤵
  - Loads dropped DLL
  - Modifies system executable filetype association
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  PID:2064

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Privilege Escalation

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

symsrv.dll

Path C:\Program Files\Common Files\System\symsrv.dll
Size 67KB
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab
SSDEEP 1536:YjV8y93KQpFQmPLRk7G50zy/riF12jvRyo0hQk7ZL:c8y93KQjy7G55riF1cMo03V
MD5 SHA1 SHA512 SSDEEP

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memory/2064-5-0x0000000002670000-0x00000000026A0000-memory.dmp

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memory/2064-4-0x0000000002670000-0x00000000026A0000-memory.dmp

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memory/2064-8-0x000000001000C000-0x000000001000D000-memory.dmp

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memory/2064-9-0x0000000010000000-0x000000001004B000-memory.dmp

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memory/2064-11-0x0000000002670000-0x00000000026A0000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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