floxif | fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5

Analysis

max time kernel
150s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
27-12-2024 04:44

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General

Target

fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe
Size

745KB
MD5

7a1ec2f3d646e9309d5eb617d8122ca2
SHA1

5ae63ea2dabb2936d1de4e530692c508ff7826bb
SHA256

fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5
SHA512

6690d28294e80325d29f91c7d09fa07973dc96530f3e704a50fc3eb82d9c7c9935d2027b85ac795b15b8c7d048b4a5de1b2c29bf85e4f61f77bfe9e29f34c81a
SSDEEP

12288:DTyjXW+48qWywrU4kGFezOAVuJ5PILOHF5DO3HYff+MRGM4h/qof23O:fIXW/8yw1ez54lIEF5SXYH+MRGJ/qofV

Score

10^/10

floxif backdoor discovery evasion persistence 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

Modifies visibility of file extensions in Explorer 2 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideFileExt = "1"	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	rundll32.exe

Detects Floxif payload 1 IoCs

backdoor

resource	yara_rule
behavioral2/files/0x000c000000023b5c-1.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000c000000023b5c-1.dat	acprotect

Executes dropped EXE 1 IoCs

pid	Process
4864	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Microsoft Windows = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Office\\rundll32.exe"	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe

Enumerates connected drives 3 TTPs 23 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
File opened (read-only)	\??\N:	rundll32.exe
File opened (read-only)	\??\Y:	rundll32.exe
File opened (read-only)	\??\L:	rundll32.exe
File opened (read-only)	\??\T:	rundll32.exe
File opened (read-only)	\??\U:	rundll32.exe
File opened (read-only)	\??\J:	rundll32.exe
File opened (read-only)	\??\K:	rundll32.exe
File opened (read-only)	\??\P:	rundll32.exe
File opened (read-only)	\??\Q:	rundll32.exe
File opened (read-only)	\??\A:	rundll32.exe
File opened (read-only)	\??\B:	rundll32.exe
File opened (read-only)	\??\G:	rundll32.exe
File opened (read-only)	\??\I:	rundll32.exe
File opened (read-only)	\??\S:	rundll32.exe
File opened (read-only)	\??\V:	rundll32.exe
File opened (read-only)	\??\W:	rundll32.exe
File opened (read-only)	\??\X:	rundll32.exe
File opened (read-only)	\??\H:	rundll32.exe
File opened (read-only)	\??\M:	rundll32.exe
File opened (read-only)	\??\O:	rundll32.exe
File opened (read-only)	\??\R:	rundll32.exe
File opened (read-only)	\??\Z:	rundll32.exe

Network Service Discovery 1 TTPs 9 IoCs

Attempt to gather information on host's network.

discovery

Network Service Discovery

T1046

pid	Process
2544	arp.exe
1452	arp.exe
1800	arp.exe
4004	arp.exe
3992	arp.exe
408	arp.exe
3268	arp.exe
4360	arp.exe
4832	arp.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000c000000023b5c-1.dat	upx
behavioral2/memory/4376-4-0x0000000010000000-0x0000000010033000-memory.dmp	upx
behavioral2/memory/4376-18-0x0000000010000000-0x0000000010033000-memory.dmp	upx

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe

System Location Discovery: System Language Discovery 1 TTPs 11 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	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	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.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 behavior: EnumeratesProcesses 2 IoCs

pid	Process
4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe
4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
664	Process not Found

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe
4864	rundll32.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 4376 wrote to memory of 1800	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	82
PID 4376 wrote to memory of 1800	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	82
PID 4376 wrote to memory of 1800	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	82
PID 4376 wrote to memory of 3992	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	84
PID 4376 wrote to memory of 3992	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	84
PID 4376 wrote to memory of 3992	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	84
PID 4376 wrote to memory of 4360	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	85
PID 4376 wrote to memory of 4360	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	85
PID 4376 wrote to memory of 4360	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	85
PID 4376 wrote to memory of 4004	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	86
PID 4376 wrote to memory of 4004	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	86
PID 4376 wrote to memory of 4004	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	86
PID 4376 wrote to memory of 4832	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	87
PID 4376 wrote to memory of 4832	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	87
PID 4376 wrote to memory of 4832	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	87
PID 4376 wrote to memory of 408	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	88
PID 4376 wrote to memory of 408	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	88
PID 4376 wrote to memory of 408	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	88
PID 4376 wrote to memory of 2544	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	89
PID 4376 wrote to memory of 2544	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	89
PID 4376 wrote to memory of 2544	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	89
PID 4376 wrote to memory of 1452	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	90
PID 4376 wrote to memory of 1452	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	90
PID 4376 wrote to memory of 1452	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	90
PID 4376 wrote to memory of 3268	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	91
PID 4376 wrote to memory of 3268	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	91
PID 4376 wrote to memory of 3268	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	91
PID 4376 wrote to memory of 4864	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	100
PID 4376 wrote to memory of 4864	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	100
PID 4376 wrote to memory of 4864	4376	fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe	100

C:\Users\Admin\AppData\Local\Temp\fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe
"C:\Users\Admin\AppData\Local\Temp\fdeede4ef69c0e0a3a3a4748b820debc7ea611f17176c996e47feeb27b37c6b5.exe"
1⤵
- Modifies visibility of file extensions in Explorer
- Modifies visiblity of hidden/system files in Explorer
- Loads dropped DLL
- Adds Run key to start application
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4376
- C:\Windows\SysWOW64\arp.exe
  arp -a
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:1800
- C:\Windows\SysWOW64\arp.exe
  arp -s 10.127.0.1 9e-4a-8f-ec-4c-20
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:3992
- C:\Windows\SysWOW64\arp.exe
  arp -s 10.127.255.255 e9-fc-b8-3a-d7-c5
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:4360
- C:\Windows\SysWOW64\arp.exe
  arp -s 49.12.169.207 ff-42-67-c8-b7-2b
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:4004
- C:\Windows\SysWOW64\arp.exe
  arp -s 224.0.0.22 25-12-7f-1e-78-8f
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:4832
- C:\Windows\SysWOW64\arp.exe
  arp -s 224.0.0.251 f5-4d-04-e6-36-b0
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:408
- C:\Windows\SysWOW64\arp.exe
  arp -s 224.0.0.252 e9-60-67-01-14-23
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:2544
- C:\Windows\SysWOW64\arp.exe
  arp -s 239.255.255.250 12-36-09-de-50-27
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:1452
- C:\Windows\SysWOW64\arp.exe
  arp -s 255.255.255.255 2c-0a-75-de-95-03
  2⤵
  - Network Service Discovery
  - System Location Discovery: System Language Discovery
  PID:3268
- C:\Users\Admin\AppData\Roaming\Microsoft\Office\rundll32.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Office\rundll32.exe
  2⤵
  - Modifies visiblity of hidden/system files in Explorer
  - Executes dropped EXE
  - Enumerates connected drives
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:4864

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Network Service Discovery

T1046

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

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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
C:\Users\Admin\AppData\Roaming\Microsoft\Office\rundll32.exe

Filesize
664KB

MD5
2eb5d76180ce7b3241b281fa79ab3483

SHA1
06293dea80e39c7eb7ee2bdb00d60b58d932fa8a

SHA256
e1b9beb4617a720d55afaec364941bb18ea2c456a8b06b30a736f0cbb5c297e8

SHA512
35f553c76fc67afb88a6a090fcbad6af3e2faae154c9c84bd869714194012525a2d42b76dad855805f107a37c351f0de08fd9a03d8ddc1dd400d64640d81b90b

Download Submit
memory/4376-4-0x0000000010000000-0x0000000010033000-memory.dmp

Filesize
204KB

Download
memory/4376-6-0x0000000000483000-0x0000000000486000-memory.dmp

Filesize
12KB

Download
memory/4376-18-0x0000000010000000-0x0000000010033000-memory.dmp

Filesize
204KB

Download