floxif | 5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
23/04/2026, 04:33

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General

Target
5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe
Size 2.7MB
Sample260423-e6jk2say6s
SHA256 5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d
MD5 f6d9c45e2f628baaeea062a3b64c6e98
SHA1 b2c3323cc74a0c7b73bc1c1d4dabf81a3604b890
SHA512 543d296953ebf3e6c420e486d0f3c3c49e4889bd6df18f2f0bac1fdae597769b636382db640cc2e68cccb8ff62cf1a5eac5c433830eae52b60fa57c09f3983e9
SSDEEP 49152:2kgz5iIBL3uE18IdLkljZmB5mJm3H+3OuZyBIOxSol1aV0HeNb4rCYTkScRW/KMC:2fWIKjZm2Jm3H+3OuZyBIOYV0HOb4rCt
TLSH
T155D5AE217761C076D5632530565ED3B8E2F9AD304D3942376281BF3D6AF4A42EA3CA3B
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor discovery floxif 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/0x000e0000000262c0-1.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000e0000000262c0-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
4528	5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000e0000000262c0-1.dat	upx
behavioral2/memory/4528-4-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/4528-11-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4268	4528	WerFault.exe	78
4036	4528	WerFault.exe	78

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	5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4528	5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe
4528	5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4528	5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4528	5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe

C:\Users\Admin\AppData\Local\Temp\5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe
"C:\Users\Admin\AppData\Local\Temp\5538fb97d09b9808abbec86e8dc4c05f4979c5cbe200bdad0806f6ed6fc09e5d.exe"
1⤵
- Loads dropped DLL
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:4528
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4528 -s 832
  2⤵
  - Program crash
  PID:4268
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4528 -s 844
  2⤵
  - Program crash
  PID:4036

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 192 -p 4528 -ip 4528
1⤵
PID:3560

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4528 -ip 4528
1⤵
PID:4068

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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/4528-4-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/4528-6-0x0000000000381000-0x0000000000382000-memory.dmp

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memory/4528-11-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/4528-9-0x0000000000380000-0x0000000000629000-memory.dmp

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