floxif | 51d67a17972d49a4577547ec4112391c0bea526f12ca5d30035ace02fb2bcb3b

Analysis

max time kernel
93s
max time network
94s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
08/08/2024, 21:22

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General

Target
51d67a17972d49a4577547ec4112391c0bea526f12ca5d30035ace02fb2bcb3b.dll
Size 955KB
Sample240808-z8d4katene
SHA256 51d67a17972d49a4577547ec4112391c0bea526f12ca5d30035ace02fb2bcb3b
MD5 aa1d5e7a93e1cd3a36b60e7b9d11440f
SHA1 cf9aa83d0a366b484fc17fe019fe184a8a9f4d23
SHA512 7023f203c83156af4e9ce7e9fd148f54d5e2d3fc97ba04cc26e7d40eb9f64f283c41ce5715d6d513e8d9c48d3cf8cb2921a104fbcca5140a9ae6eb00016fbf91
SSDEEP 24576:wr37G4Tr6sL4rCvwHIo2WEyMz7yYK8ZSmd9saBCAnVFpMrEH7N:wyxrCvPxzxbsrUF5
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

floxif backdoor discovery trojan upx

Malware Config

Signatures

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/0x00090000000233f5-3.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x00090000000233f5-3.dat	acprotect

Loads dropped DLL 2 IoCs

pid	Process
4644	rundll32.exe
4644	rundll32.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x00090000000233f5-3.dat	upx
behavioral2/memory/4644-6-0x0000000000FB0000-0x0000000000FE0000-memory.dmp	upx
behavioral2/memory/4644-10-0x0000000000FB0000-0x0000000000FE0000-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
1732	4644	WerFault.exe	83

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	4644	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1100 wrote to memory of 4644	1100	rundll32.exe	83
PID 1100 wrote to memory of 4644	1100	rundll32.exe	83
PID 1100 wrote to memory of 4644	1100	rundll32.exe	83

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\51d67a17972d49a4577547ec4112391c0bea526f12ca5d30035ace02fb2bcb3b.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1100
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\51d67a17972d49a4577547ec4112391c0bea526f12ca5d30035ace02fb2bcb3b.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:4644
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4644 -s 716
    3⤵
    - Program crash
    PID:1732

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 4644 -ip 4644
1⤵
PID:3588

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

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
MD5 SHA1 SHA512 SSDEEP

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memory/4644-6-0x0000000000FB0000-0x0000000000FE0000-memory.dmp

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memory/4644-8-0x0000000010000000-0x00000000100DF000-memory.dmp

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memory/4644-10-0x0000000000FB0000-0x0000000000FE0000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads