floxif | c66048bbee9a2ce550a5f3d94bd13ef6c306e5104cbd78e2fb9ecdc10b16a156

General

Target

c66048bbee9a2ce550a5f3d94bd13ef6c306e5104cbd78e2fb9ecdc10b16a156.dll
Size

5.0MB
MD5

14907f91e29dd57ee465f7324460369f
SHA1

2ce61b8a55dda33b8f95ce6404d6c5e63238a06e
SHA256

c66048bbee9a2ce550a5f3d94bd13ef6c306e5104cbd78e2fb9ecdc10b16a156
SHA512

1e2df060b09e735e0e71338f04928155480a3ba8c2c618dc0d3bddbfad639ef33a060246beda8984624a80d8672c12d6cf0f7c54d92cea6904e30e8f949f03e0
SSDEEP

98304:Q1cUZ1F7yaCpZnVBmIc56xfWAZOiPCMNHAXobR5brSIV95irYkRf+DgAsHIovc:Q1fZ1F7yaCpZnVBmIc56xfWAZdaMNHAA

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/0x0008000000023c9d-7.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/0x0008000000023c9d-7.dat	acprotect

Executes dropped EXE 1 IoCs

pid	Process
3360	rundll32mgr.exe

Loads dropped DLL 5 IoCs

pid	Process
3360	rundll32mgr.exe
1268	WerFault.exe
564	WerFault.exe
1840	WerFault.exe
5016	WerFault.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/memory/3360-4-0x0000000000400000-0x0000000000463000-memory.dmp	upx
behavioral2/files/0x000c000000023baa-5.dat	upx
behavioral2/files/0x0008000000023c9d-7.dat	upx
behavioral2/memory/3360-10-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/3360-20-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/3360-19-0x0000000000400000-0x0000000000463000-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
1840	4396	WerFault.exe	83
5016	3360	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	3360	rundll32mgr.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1668 wrote to memory of 4396	1668	rundll32.exe	83
PID 1668 wrote to memory of 4396	1668	rundll32.exe	83
PID 1668 wrote to memory of 4396	1668	rundll32.exe	83
PID 4396 wrote to memory of 3360	4396	rundll32.exe	84
PID 4396 wrote to memory of 3360	4396	rundll32.exe	84
PID 4396 wrote to memory of 3360	4396	rundll32.exe	84

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\c66048bbee9a2ce550a5f3d94bd13ef6c306e5104cbd78e2fb9ecdc10b16a156.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1668
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\c66048bbee9a2ce550a5f3d94bd13ef6c306e5104cbd78e2fb9ecdc10b16a156.dll,#1
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4396
- - 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:3360
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3360 -s 384
      4⤵
      Loads dropped DLL
      Program crash
      PID:5016
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4396 -s 672
    3⤵
    - Loads dropped DLL
    - Program crash
    PID:1840

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 4396 -ip 4396
1⤵
- Loads dropped DLL
PID:564

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 3360 -ip 3360
1⤵
- Loads dropped DLL
PID:1268

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

1

T1546

AppInit DLLs

1

T1546.010

Privilege Escalation

Event Triggered Execution

1

T1546

AppInit DLLs

1

T1546.010

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
209KB

MD5
59859a109082f7ce78fd48ae3c8b1441

SHA1
26aa26e72ac325967937afa567ac3b043ee06464

SHA256
1b9874755981b2183c3d2fdd25f4f09d869484dbc6643c4b62cea86e7b9fc39a

SHA512
5943a6829eeb75e23bc4f9d878dbd51629c7a9fafae913d9c3037a6b0f328708aae452b2bbc3696d7c89d47690295dceddbdcf77b1623ce7fc629cb4c21841a8

Download Submit
memory/3360-4-0x0000000000400000-0x0000000000463000-memory.dmp

Filesize
396KB

Download
memory/3360-10-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3360-12-0x00000000020D0000-0x00000000020D1000-memory.dmp

Filesize
4KB

Download
memory/3360-20-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3360-19-0x0000000000400000-0x0000000000463000-memory.dmp

Filesize
396KB

Download
memory/4396-2-0x0000000074700000-0x0000000074C13000-memory.dmp

Filesize
5.1MB

Download
memory/4396-21-0x0000000074700000-0x0000000074C13000-memory.dmp

Filesize
5.1MB

Download

Analysis

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