floxif | 837d71fd8e29b41e3a06616c8a425c181f5e57d1f8d74490a2a2b73732db77fe

Analysis

max time kernel
16s
max time network
17s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
01-01-2025 00:21

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General

Target

837d71fd8e29b41e3a06616c8a425c181f5e57d1f8d74490a2a2b73732db77fe.dll
Size

233KB
MD5

6f99b0cb043c0a3cb963ace71faa5834
SHA1

1379aa81824b374ecb9ebb29b5c6160011b80093
SHA256

837d71fd8e29b41e3a06616c8a425c181f5e57d1f8d74490a2a2b73732db77fe
SHA512

b528c3daeb6abd898f4f4e17fc5317b26e6896292d51d4b6fbf728057900a273ca55655efe9c051b587ed10f2e98e9c236bc751a74ae43d4e5dc219e04608160
SSDEEP

6144:YXLNsNlVUhSFvhvR9pOOToJBV+UdvrEFp7hKnj:CLq3Y+vMBjvrEH7Cj

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
behavioral1/files/0x00080000000120fe-1.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral1/files/0x00080000000120fe-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
1396	rundll32.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x00080000000120fe-1.dat	upx
behavioral1/memory/1396-3-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/1396-7-0x0000000010000000-0x0000000010030000-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
2152	1396	WerFault.exe	30

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	1396	rundll32.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2776 wrote to memory of 1396	2776	rundll32.exe	30
PID 2776 wrote to memory of 1396	2776	rundll32.exe	30
PID 2776 wrote to memory of 1396	2776	rundll32.exe	30
PID 2776 wrote to memory of 1396	2776	rundll32.exe	30
PID 2776 wrote to memory of 1396	2776	rundll32.exe	30
PID 2776 wrote to memory of 1396	2776	rundll32.exe	30
PID 2776 wrote to memory of 1396	2776	rundll32.exe	30
PID 1396 wrote to memory of 2152	1396	rundll32.exe	31
PID 1396 wrote to memory of 2152	1396	rundll32.exe	31
PID 1396 wrote to memory of 2152	1396	rundll32.exe	31
PID 1396 wrote to memory of 2152	1396	rundll32.exe	31

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\837d71fd8e29b41e3a06616c8a425c181f5e57d1f8d74490a2a2b73732db77fe.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2776
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\837d71fd8e29b41e3a06616c8a425c181f5e57d1f8d74490a2a2b73732db77fe.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1396
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1396 -s 336
    3⤵
    - Program crash
    PID:2152

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

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

Filesize
67KB

MD5
7574cf2c64f35161ab1292e2f532aabf

SHA1
14ba3fa927a06224dfe587014299e834def4644f

SHA256
de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085

SHA512
4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

Download Submit
memory/1396-3-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/1396-5-0x0000000074EC0000-0x0000000074EE8000-memory.dmp

Filesize
160KB

Download
memory/1396-7-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download