floxif | fd281b77b9df609d07797667915e134b2f9016e8d076cd138c78d604373cba1d

Analysis

max time kernel
90s
max time network
92s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
04-01-2025 21:05

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General

Target

fd281b77b9df609d07797667915e134b2f9016e8d076cd138c78d604373cba1dN.dll
Size

195KB
MD5

18adf201ac560456773942d0f8cd0dd0
SHA1

9b721e52050af8d97a846ff59a3b99723a331be2
SHA256

fd281b77b9df609d07797667915e134b2f9016e8d076cd138c78d604373cba1d
SHA512

a31013f2970f0d1ffae312a1380b8530626ba823c7351b36dc65cce2cdbca042df38f268f28de355950c79c9a2756026845b8417978bf45664fab862c85d2cef
SSDEEP

3072:ExwTQVjpaGmRBSW5YNbFAEvh62lQBV+UdE+rECWp7hK/Z/U:ExwEVjg5152OZBV+UdvrEFp7hK/Z/U

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/0x000c000000023b8f-1.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000c000000023b8f-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
3680	regsvr32.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000c000000023b8f-1.dat	upx
behavioral2/memory/3680-2-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/3680-7-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 1 IoCs

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

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3680	regsvr32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 452 wrote to memory of 3680	452	regsvr32.exe	83
PID 452 wrote to memory of 3680	452	regsvr32.exe	83
PID 452 wrote to memory of 3680	452	regsvr32.exe	83

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\fd281b77b9df609d07797667915e134b2f9016e8d076cd138c78d604373cba1dN.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:452
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\fd281b77b9df609d07797667915e134b2f9016e8d076cd138c78d604373cba1dN.dll
  2⤵
  - Loads dropped DLL
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:3680

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

Replay Monitor

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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/3680-2-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3680-5-0x0000000074CF1000-0x0000000074CF2000-memory.dmp

Filesize
4KB

Download
memory/3680-7-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download