floxif | a57d2030638f9c3475251d8c470ba679342c2adf98026f5a7960a788f526ca41

Analysis

max time kernel
148s
max time network
152s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
20/07/2026, 03:51

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General

Target
a57d2030638f9c3475251d8c470ba679342c2adf98026f5a7960a788f526ca41.dll
Size 306KB
Sample260720-eeykwsg14v
SHA256 a57d2030638f9c3475251d8c470ba679342c2adf98026f5a7960a788f526ca41
MD5 625284443fae79bb949d653a093cbada
SHA1 f2298371d35538ed72055dede662ea8aa9a5f493
SHA512 e8e4c23fd65a6879cf50ffcf864ffc682b87aded53f624e14d5911fa085164b3e35adb921f4712147904ab12e2eeb3059be8b88fc87e3b986f3b052e4fff0c57
SSDEEP 6144:TIIII396mbyCzp07dfFXqS+7ybfBV+UdvrEFp7hKy:zbyCt05tX1+KfBjvrEH7R
TLSH
T1FA64BF003AA187F6E1BE4E3071A9D62462FDB93C1F7888DBF3954A180DAD5C257386D7
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor discovery floxif persistence trojan upx

Malware Config

Signatures

Family: 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/0x000700000001b884-3.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000700000001b884-3.dat	acprotect

Loads dropped DLL 2 IoCs

pid	Process
1960	regsvr32.exe
1960	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	regsvr32.exe
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

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000700000001b884-3.dat	upx
behavioral2/memory/1960-6-0x0000000002D00000-0x0000000002D30000-memory.dmp	upx
behavioral2/memory/1960-8-0x0000000002D00000-0x0000000002D30000-memory.dmp	upx
behavioral2/memory/1960-10-0x0000000002D00000-0x0000000002D30000-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 39 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\Background\shellex\ContextMenuHandlers	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\InternetShortcut\shellex\ContextMenuHandlers	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\InternetShortcut\ShellEx\ContextMenuHandlers\FastCopy	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\Folder\ShellEx\ContextMenuHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\ShellEx\DragDropHandlers\FastCopy	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	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}\InProcServer32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	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\Drive\shellex\ContextMenuHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\a57d2030638f9c3475251d8c470ba679342c2adf98026f5a7960a788f526ca41.dll"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\shellex\ContextMenuHandlers\FastCopy	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\DragDropHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shellex\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	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\Directory\shellex\DragDropHandlers	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\ContextMenuHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Drive\shellex\DragDropHandlers\FastCopy	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}\ContextMenuOptIn	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\shellex\DragDropHandlers	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\background\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\*\shellex\DragDropHandlers	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\*\shellex\DragDropHandlers\FastCopy	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\shellex\ContextMenuHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\ShellEx\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Folder\ShellEx\DragDropHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{72FF462B-AB7D-427A-A268-E22E414933D7}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Directory\shellex\ContextMenuHandlers	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\InternetShortcut\ShellEx\ContextMenuHandlers\FastCopy\ = "{72FF462B-AB7D-427A-A268-E22E414933D7}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\lnkfile\shellex\ContextMenuHandlers\FastCopy	regsvr32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 4900 wrote to memory of 1960	4900	regsvr32.exe	88

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\a57d2030638f9c3475251d8c470ba679342c2adf98026f5a7960a788f526ca41.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:4900
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\a57d2030638f9c3475251d8c470ba679342c2adf98026f5a7960a788f526ca41.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:1960

Network

MITRE ATT&CK Enterprise v16

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
TLSH
T17863F1372AB5807DDD210D37949F835AB771E5A76C20643FC25907D988B8DD0E3239AE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1960-7-0x0000000002D2F000-0x0000000002D30000-memory.dmp

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memory/1960-6-0x0000000002D00000-0x0000000002D30000-memory.dmp

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memory/1960-8-0x0000000002D00000-0x0000000002D30000-memory.dmp

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memory/1960-10-0x0000000002D00000-0x0000000002D30000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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