floxif | c39570b8816c6d2a51cc84dc2a86396493c6e0723f9b5fde3e571f586a11015f

Analysis

max time kernel
110s
max time network
119s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
27/07/2024, 09:37

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General

Target

b0921654e9453f31153a3aa2b48cb9b0N.dll
Size

949KB
MD5

b0921654e9453f31153a3aa2b48cb9b0
SHA1

68444435cabd4a2de1932c89fd0bfcecb3b88f7b
SHA256

c39570b8816c6d2a51cc84dc2a86396493c6e0723f9b5fde3e571f586a11015f
SHA512

59453fd5d1e40f3565a20d831b649539e823c92682b92ff02e6b68f798b98c4935adfcf3829ff3d30670f007ab2f94d8977d0d139d459367f153ee76d40797e4
SSDEEP

24576:klqB5tUnPkmxmR0mYOlkPJHNCHtClUNFCj6sG6rEH7L:+KOmtqUTC2/N

Score

10^/10

floxif backdoor discovery persistence privilege_escalation 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/0x00080000000234cf-3.dat	floxif

Event Triggered Execution: AppInit DLLs 1 TTPs
Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes.
persistence privilege_escalation

AppInit DLLs
T1546.010

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x00080000000234cf-3.dat	acprotect

Loads dropped DLL 4 IoCs

pid	Process
4188	rundll32.exe
4188	rundll32.exe
4720	WerFault.exe
4920	WerFault.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x00080000000234cf-3.dat	upx
behavioral2/memory/4188-6-0x00000000026F0000-0x0000000002720000-memory.dmp	upx
behavioral2/memory/4188-12-0x00000000026F0000-0x0000000002720000-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
4920	4188	WerFault.exe	84

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	4188	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 436 wrote to memory of 4188	436	rundll32.exe	84
PID 436 wrote to memory of 4188	436	rundll32.exe	84
PID 436 wrote to memory of 4188	436	rundll32.exe	84

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b0921654e9453f31153a3aa2b48cb9b0N.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:436
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b0921654e9453f31153a3aa2b48cb9b0N.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:4188
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4188 -s 716
    3⤵
    - Loads dropped DLL
    - Program crash
    PID:4920

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4188 -ip 4188
1⤵
- Loads dropped DLL
PID:4720

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

T1546

AppInit DLLs

T1546.010

Privilege Escalation

Event Triggered Execution

T1546

AppInit DLLs

T1546.010

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/4188-6-0x00000000026F0000-0x0000000002720000-memory.dmp

Filesize
192KB

Download
memory/4188-10-0x0000000010000000-0x00000000100DE000-memory.dmp

Filesize
888KB

Download
memory/4188-12-0x00000000026F0000-0x0000000002720000-memory.dmp

Filesize
192KB

Download