floxif | 2c31cf8ec8c47b1d4502a4704f09eb49cc431edc0654dacf11856fc8628a0cbf

General

Target

2c31cf8ec8c47b1d4502a4704f09eb49cc431edc0654dacf11856fc8628a0cbf.dll
Size

666KB
MD5

5a515c633cd01c778a35747b64a52de4
SHA1

0d292d7949463787043e9e4fb4bc2f77945fbdc8
SHA256

2c31cf8ec8c47b1d4502a4704f09eb49cc431edc0654dacf11856fc8628a0cbf
SHA512

a35d5053b117022acac123f44087be5a280b657d04785786eac14b68a594e3eece4af7ea87ba106bcdf83d738030d1010231b85f5475a77e53b91c19649d4c0f
SSDEEP

12288:JDwfb0Ru2iNr5R+vHh0PxyrEj2d69ZNPUnfn1N:pwfgMpmvEj2dAqf1N

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/0x0008000000023c90-9.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/0x0008000000023c90-9.dat	acprotect

Executes dropped EXE 1 IoCs

pid	Process
4008	regsvr32mgr.exe

Loads dropped DLL 3 IoCs

pid	Process
4008	regsvr32mgr.exe
2544	WerFault.exe
1216	WerFault.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:	regsvr32mgr.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\regsvr32mgr.exe	regsvr32.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000c000000023ba7-5.dat	upx
behavioral2/memory/4008-6-0x0000000000400000-0x000000000045B000-memory.dmp	upx
behavioral2/files/0x0008000000023c90-9.dat	upx
behavioral2/memory/4008-12-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/4008-26-0x0000000000400000-0x000000000045B000-memory.dmp	upx
behavioral2/memory/4008-30-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	regsvr32mgr.exe
File created	\??\c:\program files\common files\system\symsrv.dll.000	regsvr32mgr.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1216	4008	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	regsvr32mgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4008	regsvr32mgr.exe
4008	regsvr32mgr.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4008	regsvr32mgr.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2284 wrote to memory of 2740	2284	regsvr32.exe	83
PID 2284 wrote to memory of 2740	2284	regsvr32.exe	83
PID 2284 wrote to memory of 2740	2284	regsvr32.exe	83
PID 2740 wrote to memory of 4008	2740	regsvr32.exe	84
PID 2740 wrote to memory of 4008	2740	regsvr32.exe	84
PID 2740 wrote to memory of 4008	2740	regsvr32.exe	84

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\2c31cf8ec8c47b1d4502a4704f09eb49cc431edc0654dacf11856fc8628a0cbf.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:2284
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\2c31cf8ec8c47b1d4502a4704f09eb49cc431edc0654dacf11856fc8628a0cbf.dll
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2740
- - C:\Windows\SysWOW64\regsvr32mgr.exe
    C:\Windows\SysWOW64\regsvr32mgr.exe
    3⤵
    - Executes dropped EXE
    - 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:4008
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4008 -s 384
      4⤵
      Loads dropped DLL
      Program crash
      PID:1216

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4008 -ip 4008
1⤵
- Loads dropped DLL
PID:2544

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

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

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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\regsvr32mgr.exe

Filesize
177KB

MD5
5c65d0f7ed0cf850e4e9cc219233d133

SHA1
093b25fe1598dbce3c9cb3aaf7da89f9e6fa321c

SHA256
c25c2eaf1dd5165bf46a36d9420d7fe718cb866831b91f22f55561fed08c7f4a

SHA512
2d404c860e037bc7b7e400ff2369de91599f15780d82364f119b356706aa3140499816c00a2bf99ba443206788ab0da527b16c3057372f803c5c112c2eae5d74

Download Submit
memory/2740-1-0x0000000000720000-0x00000000007C9000-memory.dmp

Filesize
676KB

Download
memory/2740-0-0x0000000000720000-0x00000000007C9000-memory.dmp

Filesize
676KB

Download
memory/2740-2-0x0000000000720000-0x00000000007C9000-memory.dmp

Filesize
676KB

Download
memory/4008-12-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/4008-6-0x0000000000400000-0x000000000045B000-memory.dmp

Filesize
364KB

Download
memory/4008-14-0x00000000021C0000-0x00000000021C1000-memory.dmp

Filesize
4KB

Download
memory/4008-22-0x00000000762B5000-0x00000000762B6000-memory.dmp

Filesize
4KB

Download
memory/4008-23-0x00000000762A0000-0x0000000076303000-memory.dmp

Filesize
396KB

Download
memory/4008-26-0x0000000000400000-0x000000000045B000-memory.dmp

Filesize
364KB

Download
memory/4008-27-0x00000000762A0000-0x0000000076303000-memory.dmp

Filesize
396KB

Download
memory/4008-30-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download

Analysis

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