floxif | b4c9d752f849c6682df14239d5e7dd6cd4e90f0ac7806424e8e05cd9deb6c8f4

Analysis

max time kernel
13s
max time network
19s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
16-12-2024 13:47

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General

Target

b4c9d752f849c6682df14239d5e7dd6cd4e90f0ac7806424e8e05cd9deb6c8f4N.dll
Size

4.9MB
MD5

a98c74d482855e3936850dc3d0f9ba80
SHA1

b8cbd89be935d4deb0367d33bf13bc7ffb9aaa56
SHA256

b4c9d752f849c6682df14239d5e7dd6cd4e90f0ac7806424e8e05cd9deb6c8f4
SHA512

dfe23a886320ddb678e7109527f5ef51fd3827ce07a33141ba84b570565d19a3b8baa83f68428f7694e2de00425d5e9e58500fcf80bd951049ff02ec4d7f2005
SSDEEP

98304:xlo0cEllMrJGs+Fz3WQIKQwe3Qq7DRicTllzCvAlqSZD:x2MlgynIKWpZicRU8

Score

10^/10

floxif backdoor discovery persistence privilege_escalation 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
behavioral1/files/0x000c000000012264-1.dat	floxif

Blocklisted process makes network request 1 IoCs

flow	pid	Process
6	2432	rundll32.exe

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
behavioral1/files/0x000c000000012264-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
2432	rundll32.exe

Enumerates connected drives 3 TTPs 1 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\e:	rundll32.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000c000000012264-1.dat	upx
behavioral1/memory/2432-3-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2432-10-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	rundll32.exe
File created	\??\c:\program files\common files\system\symsrv.dll.000	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 behavior: EnumeratesProcesses 1 IoCs

pid	Process
2432	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2432	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2172 wrote to memory of 2432	2172	rundll32.exe	29
PID 2172 wrote to memory of 2432	2172	rundll32.exe	29
PID 2172 wrote to memory of 2432	2172	rundll32.exe	29
PID 2172 wrote to memory of 2432	2172	rundll32.exe	29
PID 2172 wrote to memory of 2432	2172	rundll32.exe	29
PID 2172 wrote to memory of 2432	2172	rundll32.exe	29
PID 2172 wrote to memory of 2432	2172	rundll32.exe	29

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b4c9d752f849c6682df14239d5e7dd6cd4e90f0ac7806424e8e05cd9deb6c8f4N.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2172
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b4c9d752f849c6682df14239d5e7dd6cd4e90f0ac7806424e8e05cd9deb6c8f4N.dll,#1
  2⤵
  - Blocklisted process makes network request
  - Loads dropped DLL
  - Enumerates connected drives
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2432

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

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Program Files\Common Files\System\symsrv.dll

Filesize
67KB

MD5
7574cf2c64f35161ab1292e2f532aabf

SHA1
14ba3fa927a06224dfe587014299e834def4644f

SHA256
de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085

SHA512
4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

Download Submit
memory/2432-3-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2432-10-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download