floxif | 4c429ea098b40d9705f9afc1be6ffdb3260701db1d3fa1d3140475c7720b52a0

General

Target

4c429ea098b40d9705f9afc1be6ffdb3260701db1d3fa1d3140475c7720b52a0N.dll
Size

555KB
MD5

76a3937bb1dd06a48980108140572350
SHA1

fa82441bbb7eb41b25270c2a880067276b900482
SHA256

4c429ea098b40d9705f9afc1be6ffdb3260701db1d3fa1d3140475c7720b52a0
SHA512

3ab3f10e03399ca1e05bf39683f0d3946e93ca50a7fa1a083905a2bed58c04ab2463ed39334674a69d5d34fe732c1f900c4b0a7d34963ba1f54c0867c361753a
SSDEEP

6144:ARC1nhBqK9FYLHrIzkpSYWcMaYPK3jlvl2Be4RHxvP7wIACPytfAk5MepYz6bXMk:XnhBvyL5SZUN4HD4D0n1BjvrEH7eXU

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/0x000b000000012263-1.dat	floxif

Blocklisted process makes network request 4 IoCs

flow	pid	Process
5	3016	rundll32.exe
8	3016	rundll32.exe
11	3016	rundll32.exe
13	3016	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral1/files/0x000b000000012263-1.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
3016	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 6 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000b000000012263-1.dat	upx
behavioral1/memory/3016-3-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/3016-7-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/3016-11-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/3016-15-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/3016-19-0x0000000010000000-0x0000000010030000-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

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
3016	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3016	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2540 wrote to memory of 3016	2540	rundll32.exe	29
PID 2540 wrote to memory of 3016	2540	rundll32.exe	29
PID 2540 wrote to memory of 3016	2540	rundll32.exe	29
PID 2540 wrote to memory of 3016	2540	rundll32.exe	29
PID 2540 wrote to memory of 3016	2540	rundll32.exe	29
PID 2540 wrote to memory of 3016	2540	rundll32.exe	29
PID 2540 wrote to memory of 3016	2540	rundll32.exe	29

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\4c429ea098b40d9705f9afc1be6ffdb3260701db1d3fa1d3140475c7720b52a0N.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2540
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\4c429ea098b40d9705f9afc1be6ffdb3260701db1d3fa1d3140475c7720b52a0N.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:3016

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
67KB

MD5
7574cf2c64f35161ab1292e2f532aabf

SHA1
14ba3fa927a06224dfe587014299e834def4644f

SHA256
de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085

SHA512
4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

Download Submit
memory/3016-3-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3016-7-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3016-5-0x00000000753F0000-0x0000000075470000-memory.dmp

Filesize
512KB

Download
memory/3016-8-0x00000000753F0000-0x0000000075470000-memory.dmp

Filesize
512KB

Download
memory/3016-11-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3016-15-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3016-14-0x00000000753F0000-0x0000000075470000-memory.dmp

Filesize
512KB

Download
memory/3016-19-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download

Analysis

Sharing