floxif | bf791a2f43ce7856ad76c87f06cb323735a92acb1a4f17f4c5a6ea93a973ab19

Analysis

max time kernel
434s
max time network
456s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
27-12-2024 11:11

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General

Target

data/libusb/x86/libusb0_x86.dll
Size

142KB
MD5

8145fa60f4a03ebea156df68f8c6f948
SHA1

3cf02457805ea647bd6153bc7401521a94eacc5f
SHA256

4eeabdd57ca7b7028e3981c43fb92494f93c752c2032cf33e0ec9da01e3e4a9a
SHA512

ea9c6c28a7ca5d112ab12f437495c079ab25243cf33d86098ea34683ac6d7a270dce8df5371ae9208c25917d2e249c7cb2584f95ea1f2442fba92e1673ec30cf
SSDEEP

3072:jzwLjtSIiRsjNh5IlmBA2lQBV+UdE+rECWp7hKh2Pqt1o:jS0nREAKOBV+UdvrEFp7hKsD

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
behavioral14/files/0x0009000000029ed0-1.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral14/files/0x0009000000029ed0-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
760	rundll32.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral14/files/0x0009000000029ed0-1.dat	upx
behavioral14/memory/760-4-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral14/memory/760-6-0x0000000010000000-0x0000000010030000-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

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	760	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2488 wrote to memory of 760	2488	rundll32.exe	77
PID 2488 wrote to memory of 760	2488	rundll32.exe	77
PID 2488 wrote to memory of 760	2488	rundll32.exe	77

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\data\libusb\x86\libusb0_x86.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2488
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\data\libusb\x86\libusb0_x86.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:760

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/760-4-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/760-5-0x0000000075803000-0x0000000075804000-memory.dmp

Filesize
4KB

Download
memory/760-6-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download