floxif | f2d65b594c69bf7157a7a7900b4410032fd89e782186b8f001640412aeffcde0

General

Target

f2d65b594c69bf7157a7a7900b4410032fd89e782186b8f001640412aeffcde0.dll
Size

421KB
MD5

1cda976305183864d4bd0e9fef64038c
SHA1

fb2f7fdb705a1ab6db62d0889ca6012a0f7ace38
SHA256

f2d65b594c69bf7157a7a7900b4410032fd89e782186b8f001640412aeffcde0
SHA512

73684e398359db57f040d5fcec2afd60700aaa02f305ef610f02613ca8df0e2b215a9ae2f9880ef5a44629089b823664fb8bd01dbf17938154d82bb574d6acab
SSDEEP

6144:5F/pG4LWq/IkJakr3xrbKgxXZ0UnrQ6O6agZCPUgidwvRC4Kmnc:5zPWJKakNrbKSmb69ZNPUnfnc

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

Processes:

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

Processes:

resource	yara_rule
C:\Program Files\Common Files\System\symsrv.dll	acprotect

Executes dropped EXE 1 IoCs

Processes:

rundll32mgr.exe

pid process

3368 rundll32mgr.exe
Loads dropped DLL 3 IoCs

Processes:

rundll32mgr.exeWerFault.exeWerFault.exe

pid process

3368 rundll32mgr.exe
2068 WerFault.exe
3696 WerFault.exe
Drops file in System32 directory 1 IoCs

Processes:

rundll32.exe

description ioc process

File created C:\Windows\SysWOW64\rundll32mgr.exe rundll32.exe

pid	process
3368	rundll32mgr.exe

pid	process
3368	rundll32mgr.exe
2068	WerFault.exe
3696	WerFault.exe

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

Processes:

resource	yara_rule
C:\Windows\SysWOW64\rundll32mgr.exe	upx
behavioral2/memory/3368-5-0x0000000000400000-0x000000000045B000-memory.dmp	upx
behavioral2/memory/3368-10-0x0000000010000000-0x0000000010030000-memory.dmp	upx
C:\Program Files\Common Files\System\symsrv.dll	upx
behavioral2/memory/3368-15-0x0000000000400000-0x000000000045B000-memory.dmp	upx
behavioral2/memory/3368-17-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 1 IoCs

Processes:

rundll32mgr.exe

description ioc process

File created C:\Program Files\Common Files\System\symsrv.dll rundll32mgr.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

3696 3368 WerFault.exe rundll32mgr.exe

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

pid	pid_target	process	target process
3696	3368	WerFault.exe	rundll32mgr.exe

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

Processes:

rundll32.exerundll32mgr.exe

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

Processes:

rundll32mgr.exe

description pid process

Token: SeDebugPrivilege 3368 rundll32mgr.exe

description	pid	process
Token: SeDebugPrivilege	3368	rundll32mgr.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

rundll32.exerundll32.exe

description	pid	process	target process
PID 2892 wrote to memory of 1596	2892	rundll32.exe	rundll32.exe
PID 2892 wrote to memory of 1596	2892	rundll32.exe	rundll32.exe
PID 2892 wrote to memory of 1596	2892	rundll32.exe	rundll32.exe
PID 1596 wrote to memory of 3368	1596	rundll32.exe	rundll32mgr.exe
PID 1596 wrote to memory of 3368	1596	rundll32.exe	rundll32mgr.exe
PID 1596 wrote to memory of 3368	1596	rundll32.exe	rundll32mgr.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\f2d65b594c69bf7157a7a7900b4410032fd89e782186b8f001640412aeffcde0.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2892
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\f2d65b594c69bf7157a7a7900b4410032fd89e782186b8f001640412aeffcde0.dll,#1
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1596
- - 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:3368
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3368 -s 384
      4⤵
      Loads dropped DLL
      Program crash
      PID:3696

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3368 -ip 3368
1⤵
- Loads dropped DLL
PID:2068

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

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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/1596-0-0x0000000036600000-0x000000003666D000-memory.dmp

Filesize
436KB

Download
memory/3368-5-0x0000000000400000-0x000000000045B000-memory.dmp

Filesize
364KB

Download
memory/3368-10-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/3368-12-0x0000000002080000-0x0000000002081000-memory.dmp

Filesize
4KB

Download
memory/3368-15-0x0000000000400000-0x000000000045B000-memory.dmp

Filesize
364KB

Download
memory/3368-17-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads