floxif | 4b377a3613df27ee4b6227d88ab6979dd4388967f43d1db911aed820a73372d8

Analysis

max time kernel
94s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02-01-2025 22:41

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General

Target

4b377a3613df27ee4b6227d88ab6979dd4388967f43d1db911aed820a73372d8.dll
Size

962KB
MD5

0b1017c9fb3332384dc262ace8045c64
SHA1

bb569217eb2ec5cfeac26dbc686911a7a37c9375
SHA256

4b377a3613df27ee4b6227d88ab6979dd4388967f43d1db911aed820a73372d8
SHA512

be1058cb4b2bf3a8fbfe2200dcbd26c76b5956a5f3ebf3640af7162e257e562ea68cfaa8539d1db15b7639f74ee26f1c33e772d88a9db3a3a298b014ae24c426
SSDEEP

24576:bqNAogNi7/VMjAA4LVL8pJsv6tWKFdu9CcuuKTr9zORCrEH7B:GEiRMEb9GJsv6tWKFdu9CtuKTJzs

Score

10^/10

floxif backdoor discovery trojan upx

Malware Config

Signatures

Floxif family
floxif
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/0x000c000000023b37-1.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000c000000023b37-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
3508	rundll32.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3508-4-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/files/0x000c000000023b37-1.dat	upx
behavioral2/memory/3508-10-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	rundll32.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
384	3508	WerFault.exe	85

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	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3508	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1312 wrote to memory of 3508	1312	rundll32.exe	85
PID 1312 wrote to memory of 3508	1312	rundll32.exe	85
PID 1312 wrote to memory of 3508	1312	rundll32.exe	85

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\4b377a3613df27ee4b6227d88ab6979dd4388967f43d1db911aed820a73372d8.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1312
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\4b377a3613df27ee4b6227d88ab6979dd4388967f43d1db911aed820a73372d8.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:3508
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3508 -s 744
    3⤵
    - Program crash
    PID:384

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3508 -ip 3508
1⤵
PID:2556

Network

MITRE ATT&CK Enterprise v15

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

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Downloads

C:\Program Files\Common Files\System\symsrv.dll

Filesize
67KB

MD5
7574cf2c64f35161ab1292e2f532aabf

SHA1
14ba3fa927a06224dfe587014299e834def4644f

SHA256
de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085

SHA512
4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

Download Submit
memory/3508-4-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3508-5-0x00000000751B1000-0x00000000751B2000-memory.dmp

Filesize
4KB

Download
memory/3508-6-0x00000000751B0000-0x000000007528E000-memory.dmp

Filesize
888KB

Download
memory/3508-10-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download