floxif | 484a3e404f1118f8586643b86afddd3a29add3e59e88595181a174c2286131fc

Analysis

max time kernel
148s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
01-01-2025 22:38

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General

Target

484a3e404f1118f8586643b86afddd3a29add3e59e88595181a174c2286131fc.dll
Size

1.5MB
MD5

59d568e7483501f291463cef00f90dc7
SHA1

41c7314c75c6f4b8fcec7b837ca896b2738da813
SHA256

484a3e404f1118f8586643b86afddd3a29add3e59e88595181a174c2286131fc
SHA512

5e5371e5bee825608ea45ea9956d14f7b2e40ca9dbc8f985856f6b17d52784a75418c6c12b2d2bd2f0a4354bf2e247a308dbc13b6e1a7fab5c8d60066c4d0d18
SSDEEP

49152:ffLu5HYuMnlY/Qro+edHV7pBSumNh+qKKZqq1qA:ff3uwY/ddHhpBcPLqqUA

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
behavioral2/files/0x000d000000023b3f-3.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000d000000023b3f-3.dat	acprotect

Loads dropped DLL 2 IoCs

pid	Process
404	rundll32.exe
404	rundll32.exe

Network Service Discovery 1 TTPs 9 IoCs

Attempt to gather information on host's network.

discovery

Network Service Discovery

T1046

pid	Process
548	arp.exe
1912	arp.exe
452	arp.exe
4908	arp.exe
2928	arp.exe
1660	arp.exe
3296	arp.exe
4740	arp.exe
1264	arp.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\rundll32.rpt	rundll32.exe
File created	C:\Windows\SysWOW64\rundll32.dmp	rundll32.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000d000000023b3f-3.dat	upx
behavioral2/memory/404-7-0x0000000000890000-0x00000000008C3000-memory.dmp	upx
behavioral2/memory/404-6-0x0000000010000000-0x00000000104D8000-memory.dmp	upx
behavioral2/memory/404-17-0x0000000000890000-0x00000000008C3000-memory.dmp	upx
behavioral2/memory/404-15-0x0000000010000000-0x00000000104D8000-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
4080	404	WerFault.exe	83

System Location Discovery: System Language Discovery 1 TTPs 10 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	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
404	rundll32.exe
404	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	404	rundll32.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3776 wrote to memory of 404	3776	rundll32.exe	83
PID 3776 wrote to memory of 404	3776	rundll32.exe	83
PID 3776 wrote to memory of 404	3776	rundll32.exe	83
PID 404 wrote to memory of 4740	404	rundll32.exe	84
PID 404 wrote to memory of 4740	404	rundll32.exe	84
PID 404 wrote to memory of 4740	404	rundll32.exe	84
PID 404 wrote to memory of 1264	404	rundll32.exe	86
PID 404 wrote to memory of 1264	404	rundll32.exe	86
PID 404 wrote to memory of 1264	404	rundll32.exe	86
PID 404 wrote to memory of 4908	404	rundll32.exe	87
PID 404 wrote to memory of 4908	404	rundll32.exe	87
PID 404 wrote to memory of 4908	404	rundll32.exe	87
PID 404 wrote to memory of 3296	404	rundll32.exe	88
PID 404 wrote to memory of 3296	404	rundll32.exe	88
PID 404 wrote to memory of 3296	404	rundll32.exe	88
PID 404 wrote to memory of 548	404	rundll32.exe	89
PID 404 wrote to memory of 548	404	rundll32.exe	89
PID 404 wrote to memory of 548	404	rundll32.exe	89
PID 404 wrote to memory of 1660	404	rundll32.exe	90
PID 404 wrote to memory of 1660	404	rundll32.exe	90
PID 404 wrote to memory of 1660	404	rundll32.exe	90
PID 404 wrote to memory of 2928	404	rundll32.exe	91
PID 404 wrote to memory of 2928	404	rundll32.exe	91
PID 404 wrote to memory of 2928	404	rundll32.exe	91
PID 404 wrote to memory of 452	404	rundll32.exe	92
PID 404 wrote to memory of 452	404	rundll32.exe	92
PID 404 wrote to memory of 452	404	rundll32.exe	92
PID 404 wrote to memory of 1912	404	rundll32.exe	93
PID 404 wrote to memory of 1912	404	rundll32.exe	93
PID 404 wrote to memory of 1912	404	rundll32.exe	93

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\484a3e404f1118f8586643b86afddd3a29add3e59e88595181a174c2286131fc.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3776
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\484a3e404f1118f8586643b86afddd3a29add3e59e88595181a174c2286131fc.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:404
- - C:\Windows\SysWOW64\arp.exe
    arp -a
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:4740
- - C:\Windows\SysWOW64\arp.exe
    arp -s 10.127.0.1 f7-ed-34-0f-68-0f
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:1264
- - C:\Windows\SysWOW64\arp.exe
    arp -s 10.127.255.255 dd-56-51-b3-c9-2a
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:4908
- - C:\Windows\SysWOW64\arp.exe
    arp -s 37.27.61.181 17-2a-e4-6f-47-f7
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:3296
- - C:\Windows\SysWOW64\arp.exe
    arp -s 224.0.0.22 18-11-e3-1a-35-09
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:548
- - C:\Windows\SysWOW64\arp.exe
    arp -s 224.0.0.251 d5-26-20-b2-61-ba
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:1660
- - C:\Windows\SysWOW64\arp.exe
    arp -s 224.0.0.252 07-ae-3c-e2-bb-76
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:2928
- - C:\Windows\SysWOW64\arp.exe
    arp -s 239.255.255.250 97-d0-e7-13-ca-62
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:452
- - C:\Windows\SysWOW64\arp.exe
    arp -s 255.255.255.255 fc-f4-96-09-57-ad
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:1912
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 404 -s 848
    3⤵
    - Program crash
    PID:4080

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 404 -ip 404
1⤵
PID:5000

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Network Service Discovery

T1046

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
71KB

MD5
4fcd7574537cebec8e75b4e646996643

SHA1
efa59bb9050fb656b90d5d40c942fb2a304f2a8b

SHA256
8ea3b17e4b783ffc0bc387b81b823bf87af0d57da74541d88ba85314bb232a5d

SHA512
7f1a7ef64d332a735db82506b47d84853af870785066d29ccaf4fdeab114079a9f0db400e01ba574776a0d652a248658fe1e8f9659cdced19ad6eea09644ea3e

Download Submit
memory/404-8-0x00000000104D4000-0x00000000104D5000-memory.dmp

Filesize
4KB

Download
memory/404-7-0x0000000000890000-0x00000000008C3000-memory.dmp

Filesize
204KB

Download
memory/404-6-0x0000000010000000-0x00000000104D8000-memory.dmp

Filesize
4.8MB

Download
memory/404-17-0x0000000000890000-0x00000000008C3000-memory.dmp

Filesize
204KB

Download
memory/404-15-0x0000000010000000-0x00000000104D8000-memory.dmp

Filesize
4.8MB

Download