floxif | 37ab609349ba4c858c6e3487a24a431c450798e3d9dc7a13b22f08ae5fb6a58c

Analysis

max time kernel
101s
max time network
105s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
16/08/2024, 16:04

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General

Target
99f58ab2d04f94c150d8a256858f6420N.dll
Size 4.0MB
Sample240816-thx6vstdqe
SHA256 37ab609349ba4c858c6e3487a24a431c450798e3d9dc7a13b22f08ae5fb6a58c
MD5 99f58ab2d04f94c150d8a256858f6420
SHA1 c06092535c7d897e096e449d1f01cac654c3a5b1
SHA512 884df307414f40d5764dbaf4e817d203391c20f50f8156acf2c43cdb2cbeafc680134cf7686819b0405c8eab63370691cf8895dc7df1caaf34693884877f20e6
SSDEEP 49152:2L4EbUvu5jL53soP+DaOVv8pHIARyHqinLMTPfuQ1TAvO/HGzQkQSdaI:2L4AfsLv5AkH7LMruQSyHlkQSX
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/0x000900000002345b-1.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000900000002345b-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
5012	rundll32.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000900000002345b-1.dat	upx
behavioral2/memory/5012-4-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/5012-8-0x0000000010000000-0x0000000010030000-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
3272	5012	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	5012	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3300 wrote to memory of 5012	3300	rundll32.exe	83
PID 3300 wrote to memory of 5012	3300	rundll32.exe	83
PID 3300 wrote to memory of 5012	3300	rundll32.exe	83

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\99f58ab2d04f94c150d8a256858f6420N.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3300
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\99f58ab2d04f94c150d8a256858f6420N.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:5012
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 5012 -s 720
    3⤵
    - Program crash
    PID:3272

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 5012 -ip 5012
1⤵
PID:1920

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/5012-4-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/5012-8-0x0000000010000000-0x0000000010030000-memory.dmp

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memory/5012-6-0x0000000074E10000-0x000000007522D000-memory.dmp

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Analysis

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General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads