floxif | b9ab713bd6eecb4c68b4ad696cefe33e8d8a33d0f404f21e0266b5b9411475f5

General

Target

b9ab713bd6eecb4c68b4ad696cefe33e8d8a33d0f404f21e0266b5b9411475f5.dll
Size

1.0MB
MD5

c95b3bde8f371bf70c7dd1a901ad7deb
SHA1

aaecc8bec6f7b5e696d23fdb85e3bf2f7dbe45df
SHA256

b9ab713bd6eecb4c68b4ad696cefe33e8d8a33d0f404f21e0266b5b9411475f5
SHA512

6ef48a6605c07265ac2b2070afaa8abccb3e597cea02d0b54a4d6a5aa28dcb93f86e1df42dabed2815186e873a15d52692c9a20232674a8cc286ad5b179cf915
SSDEEP

24576:vEun9gaWTCW8l04r6kLiCs8LPYZpJkSXTAqfA:vEun97jl0sVLZLPcJkSXT6

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/0x0007000000023cbc-6.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x0007000000023cbc-6.dat	acprotect

Executes dropped EXE 1 IoCs

pid	Process
860	rundll32mgr.exe

Loads dropped DLL 1 IoCs

pid	Process
860	rundll32mgr.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\rundll32mgr.exe	rundll32.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0009000000023cb8-3.dat	upx
behavioral2/files/0x0007000000023cbc-6.dat	upx
behavioral2/memory/860-10-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/860-7-0x0000000000400000-0x000000000045B000-memory.dmp	upx
behavioral2/memory/860-13-0x0000000000400000-0x000000000045B000-memory.dmp	upx
behavioral2/memory/860-15-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	rundll32mgr.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4804	4324	WerFault.exe	83
2664	860	WerFault.exe	84

System Location Discovery: System Language Discovery 1 TTPs 2 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	rundll32mgr.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	860	rundll32mgr.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4792 wrote to memory of 4324	4792	rundll32.exe	83
PID 4792 wrote to memory of 4324	4792	rundll32.exe	83
PID 4792 wrote to memory of 4324	4792	rundll32.exe	83
PID 4324 wrote to memory of 860	4324	rundll32.exe	84
PID 4324 wrote to memory of 860	4324	rundll32.exe	84
PID 4324 wrote to memory of 860	4324	rundll32.exe	84

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b9ab713bd6eecb4c68b4ad696cefe33e8d8a33d0f404f21e0266b5b9411475f5.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4792
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b9ab713bd6eecb4c68b4ad696cefe33e8d8a33d0f404f21e0266b5b9411475f5.dll,#1
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4324
- - C:\Windows\SysWOW64\rundll32mgr.exe
    C:\Windows\SysWOW64\rundll32mgr.exe
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:860
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 860 -s 384
      4⤵
      Program crash
      PID:2664
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4324 -s 632
    3⤵
    - Program crash
    PID:4804

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4324 -ip 4324
1⤵
PID:3764

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 860 -ip 860
1⤵
PID:2096

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
67KB

MD5
7574cf2c64f35161ab1292e2f532aabf

SHA1
14ba3fa927a06224dfe587014299e834def4644f

SHA256
de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085

SHA512
4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

Download Submit
C:\Windows\SysWOW64\rundll32mgr.exe

Filesize
177KB

MD5
5c65d0f7ed0cf850e4e9cc219233d133

SHA1
093b25fe1598dbce3c9cb3aaf7da89f9e6fa321c

SHA256
c25c2eaf1dd5165bf46a36d9420d7fe718cb866831b91f22f55561fed08c7f4a

SHA512
2d404c860e037bc7b7e400ff2369de91599f15780d82364f119b356706aa3140499816c00a2bf99ba443206788ab0da527b16c3057372f803c5c112c2eae5d74

Download Submit
memory/860-10-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/860-7-0x0000000000400000-0x000000000045B000-memory.dmp

Filesize
364KB

Download
memory/860-12-0x0000000000580000-0x0000000000581000-memory.dmp

Filesize
4KB

Download
memory/860-13-0x0000000000400000-0x000000000045B000-memory.dmp

Filesize
364KB

Download
memory/860-15-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/4324-1-0x0000000051DF0000-0x0000000051EF5000-memory.dmp

Filesize
1.0MB

Download
memory/4324-16-0x0000000051DF0000-0x0000000051EF5000-memory.dmp

Filesize
1.0MB

Download

Analysis

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