floxif | b99d6d0e0efee084431ee80b424709489e5e1acb0d56d025a66da7648a74874c

Analysis

max time kernel
92s
max time network
93s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
04-01-2025 10:00

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General

Target

b99d6d0e0efee084431ee80b424709489e5e1acb0d56d025a66da7648a74874cN.dll
Size

163KB
MD5

27f76da4410dc3ca013cf6f4c4441880
SHA1

45d23109b5409152c3d8f2ec54b2a2f72dfd10ba
SHA256

b99d6d0e0efee084431ee80b424709489e5e1acb0d56d025a66da7648a74874c
SHA512

ea1fba057ec0c2c9cb9996cc832e26e430c7d24f72984ba9fa5b298f3915b19e8f95a7d2fd2b14bdf1ecd996bf0d608eaf97746b1db01a904a557ad42fa0841a
SSDEEP

3072:ryy9dPX0+CIZyTmPP56e5lmeqsQvVqRlkM4OAD/KLznBuB2JA2BjtSEJ1:rFd8+CIEGieqsQvMRlkM4RD/qzMfUhSk

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
behavioral2/files/0x000c000000023b0f-2.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/0x000c000000023b0f-2.dat	acprotect

Loads dropped DLL 4 IoCs

pid	Process
744	rundll32.exe
744	rundll32.exe
4008	WerFault.exe
2680	WerFault.exe

Network Service Discovery 1 TTPs 9 IoCs

Attempt to gather information on host's network.

discovery

Network Service Discovery

T1046

pid	Process
4956	arp.exe
1788	arp.exe
4988	arp.exe
1572	arp.exe
2376	arp.exe
3668	arp.exe
1968	arp.exe
4476	arp.exe
3676	arp.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000c000000023b0f-2.dat	upx
behavioral2/memory/744-6-0x0000000000790000-0x00000000007C3000-memory.dmp	upx
behavioral2/memory/744-13-0x0000000000790000-0x00000000007C3000-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
2680	744	WerFault.exe	85

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	rundll32.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	arp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arp.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	744	rundll32.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2672 wrote to memory of 744	2672	rundll32.exe	85
PID 2672 wrote to memory of 744	2672	rundll32.exe	85
PID 2672 wrote to memory of 744	2672	rundll32.exe	85
PID 744 wrote to memory of 2376	744	rundll32.exe	86
PID 744 wrote to memory of 2376	744	rundll32.exe	86
PID 744 wrote to memory of 2376	744	rundll32.exe	86
PID 744 wrote to memory of 4988	744	rundll32.exe	90
PID 744 wrote to memory of 4988	744	rundll32.exe	90
PID 744 wrote to memory of 4988	744	rundll32.exe	90
PID 744 wrote to memory of 1788	744	rundll32.exe	91
PID 744 wrote to memory of 1788	744	rundll32.exe	91
PID 744 wrote to memory of 1788	744	rundll32.exe	91
PID 744 wrote to memory of 1572	744	rundll32.exe	92
PID 744 wrote to memory of 1572	744	rundll32.exe	92
PID 744 wrote to memory of 1572	744	rundll32.exe	92
PID 744 wrote to memory of 4956	744	rundll32.exe	93
PID 744 wrote to memory of 4956	744	rundll32.exe	93
PID 744 wrote to memory of 4956	744	rundll32.exe	93
PID 744 wrote to memory of 3668	744	rundll32.exe	94
PID 744 wrote to memory of 3668	744	rundll32.exe	94
PID 744 wrote to memory of 3668	744	rundll32.exe	94
PID 744 wrote to memory of 3676	744	rundll32.exe	95
PID 744 wrote to memory of 3676	744	rundll32.exe	95
PID 744 wrote to memory of 3676	744	rundll32.exe	95
PID 744 wrote to memory of 1968	744	rundll32.exe	96
PID 744 wrote to memory of 1968	744	rundll32.exe	96
PID 744 wrote to memory of 1968	744	rundll32.exe	96
PID 744 wrote to memory of 4476	744	rundll32.exe	97
PID 744 wrote to memory of 4476	744	rundll32.exe	97
PID 744 wrote to memory of 4476	744	rundll32.exe	97

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b99d6d0e0efee084431ee80b424709489e5e1acb0d56d025a66da7648a74874cN.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2672
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b99d6d0e0efee084431ee80b424709489e5e1acb0d56d025a66da7648a74874cN.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:744
- - C:\Windows\SysWOW64\arp.exe
    arp -a
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:2376
- - C:\Windows\SysWOW64\arp.exe
    arp -s 10.127.0.1 2e-da-f0-1e-ff-de
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:4988
- - C:\Windows\SysWOW64\arp.exe
    arp -s 10.127.255.255 be-6f-4e-af-bb-6a
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:1788
- - C:\Windows\SysWOW64\arp.exe
    arp -s 37.27.61.181 93-e9-62-91-82-ac
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:1572
- - C:\Windows\SysWOW64\arp.exe
    arp -s 224.0.0.22 fd-17-42-2b-d4-44
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:4956
- - C:\Windows\SysWOW64\arp.exe
    arp -s 224.0.0.251 0e-4d-b5-f2-dc-09
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:3668
- - C:\Windows\SysWOW64\arp.exe
    arp -s 224.0.0.252 c8-7f-fb-9d-33-9b
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:3676
- - C:\Windows\SysWOW64\arp.exe
    arp -s 239.255.255.250 07-c9-ce-b0-8c-5b
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:1968
- - C:\Windows\SysWOW64\arp.exe
    arp -s 255.255.255.255 3a-5a-e4-71-db-2a
    3⤵
    - Network Service Discovery
    - System Location Discovery: System Language Discovery
    PID:4476
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 744 -s 888
    3⤵
    - Loads dropped DLL
    - Program crash
    PID:2680

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 744 -ip 744
1⤵
- Loads dropped DLL
PID:4008

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

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/744-0-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/744-5-0x0000000000790000-0x00000000007C3000-memory.dmp

Filesize
204KB

Download
memory/744-6-0x0000000000790000-0x00000000007C3000-memory.dmp

Filesize
204KB

Download
memory/744-12-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/744-13-0x0000000000790000-0x00000000007C3000-memory.dmp

Filesize
204KB

Download