floxif | 39e0e99686f3ff4871a53ab3700bd7e5b0fa9a1de1eb9fd90b9be77eb1bc5483

General

Target

39e0e99686f3ff4871a53ab3700bd7e5b0fa9a1de1eb9fd90b9be77eb1bc5483.dll
Size

296KB
MD5

8f4c7d749a2349d1a7d722be0ccef703
SHA1

cc4a971226e48748d4e07adf11a0c303bd44b1b4
SHA256

39e0e99686f3ff4871a53ab3700bd7e5b0fa9a1de1eb9fd90b9be77eb1bc5483
SHA512

71def671627382022def2060ac87e057077075a7eb745a0d67b18430b3d06dd670d830d68bb2448a2e567bb5f679a11faa8f518e84490c51ad58b05d6a1ebc93
SSDEEP

6144:r5y5VKltxeqbaacNnrQ6O6agZCPUgidwvRC4Kmnw:r5y5sltxeqbaar69ZNPUnfnw

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

Processes:

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

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:

regsvr32mgr.exe

pid process

732 regsvr32mgr.exe
Loads dropped DLL 1 IoCs

Processes:

regsvr32mgr.exe

pid process

732 regsvr32mgr.exe
Drops file in System32 directory 1 IoCs

Processes:

regsvr32.exe

description ioc process

File created C:\Windows\SysWOW64\regsvr32mgr.exe regsvr32.exe

pid	process
732	regsvr32mgr.exe

pid	process
732	regsvr32mgr.exe

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

Processes:

resource	yara_rule
C:\Windows\SysWOW64\regsvr32mgr.exe	upx
behavioral2/memory/732-4-0x0000000000400000-0x000000000045B000-memory.dmp	upx
behavioral2/memory/732-10-0x0000000010000000-0x0000000010030000-memory.dmp	upx
C:\Program Files\Common Files\System\symsrv.dll	upx
behavioral2/memory/732-16-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral2/memory/732-15-0x0000000000400000-0x000000000045B000-memory.dmp	upx

Drops file in Program Files directory 1 IoCs

Processes:

regsvr32mgr.exe

description ioc process

File created C:\Program Files\Common Files\System\symsrv.dll regsvr32mgr.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

876 732 WerFault.exe regsvr32mgr.exe

description	ioc	process
File created	C:\Program Files\Common Files\System\symsrv.dll	regsvr32mgr.exe

pid	pid_target	process	target process
876	732	WerFault.exe	regsvr32mgr.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:

regsvr32mgr.exeregsvr32.exe

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

Modifies registry class 64 IoCs

Processes:

regsvr32.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{A1741EF6-FFC6-11D0-BD02-00C04FC2FB86}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataValue.1\ = "StdDataValue Object"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E675F3F0-91B5-11D0-9484-00A0C91110ED}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{A1741EF6-FFC6-11D0-BD02-00C04FC2FB86}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{C2F13ED0-91B0-11D0-9484-00A0C91110ED}\ProxyStubClsid32\ = "{00020420-0000-0000-C000-000000000046}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{99FF4676-FFC3-11D0-BD02-00C04FC2FB86}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{99FF4676-FFC3-11D0-BD02-00C04FC2FB86}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataFormat\CurVer	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2B11E9B0-9F09-11D0-9484-00A0C91110ED}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataValue\CLSID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2B11E9B0-9F09-11D0-9484-00A0C91110ED}\Programmable	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataFormats.1\CLSID\ = "{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{C2F13ED0-91B0-11D0-9484-00A0C91110ED}\ProxyStubClsid32\ = "{00020420-0000-0000-C000-000000000046}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{6C51B910-900B-11D0-9484-00A0C91110ED}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{6C51B910-900B-11D0-9484-00A0C91110ED}\TypeLib\ = "{6B263850-900B-11D0-9484-00A0C91110ED}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{99FF4676-FFC3-11D0-BD02-00C04FC2FB86}\TypeLib\Version = "1.0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataFormat\CLSID\ = "{6D835690-900B-11D0-9484-00A0C91110ED}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2B11E9B0-9F09-11D0-9484-00A0C91110ED}\TypeLib\ = "{6B263850-900B-11D0-9484-00A0C91110ED}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataFormats\CurVer	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E675F3F0-91B5-11D0-9484-00A0C91110ED}\TypeLib\ = "{6B263850-900B-11D0-9484-00A0C91110ED}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{C2F13ED0-91B0-11D0-9484-00A0C91110ED}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{99FF4676-FFC3-11D0-BD02-00C04FC2FB86}\TypeLib\ = "{6B263850-900B-11D0-9484-00A0C91110ED}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{99FF4676-FFC3-11D0-BD02-00C04FC2FB86}\TypeLib	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataValue\CurVer	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2B11E9B0-9F09-11D0-9484-00A0C91110ED}\VersionIndependentProgID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}\ProgID\ = "MSSTDFMT.StdDataFormats.1"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{99FF4676-FFC3-11D0-BD02-00C04FC2FB86}\ = "IStdDataFormatsDisp"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}\ProgID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}\ProgID\ = "MSSTDFMT.StdDataFormat.1"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{6B263850-900B-11D0-9484-00A0C91110ED}\1.0\HELPDIR	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}\InprocServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}\Version\ = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{E675F3F0-91B5-11D0-9484-00A0C91110ED}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataFormat\CLSID	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2B11E9B0-9F09-11D0-9484-00A0C91110ED}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{C2F13ED0-91B0-11D0-9484-00A0C91110ED}\TypeLib\Version = "1.0"	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}\Implemented Categories	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{C2F13ED0-91B0-11D0-9484-00A0C91110ED}\ProxyStubClsid32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{5DE7A180-91B1-11D0-9484-00A0C91110ED}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{6C51B910-900B-11D0-9484-00A0C91110ED}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{A1741EF6-FFC6-11D0-BD02-00C04FC2FB86}\TypeLib\Version = "1.0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}\InprocServer32\ThreadingModel = "Apartment"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}\ = "StdDataFormats Object"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{5DE7A180-91B1-11D0-9484-00A0C91110ED}\ = "IStdDataValueDisp"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{6C51B910-900B-11D0-9484-00A0C91110ED}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{99FF4676-FFC3-11D0-BD02-00C04FC2FB86}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{699DDBCC-DC7E-11D0-BCF7-00C04FC2FB86}\InprocServer32\ThreadingModel = "Apartment"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{5DE7A180-91B1-11D0-9484-00A0C91110ED}\TypeLib\ = "{6B263850-900B-11D0-9484-00A0C91110ED}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{5DE7A180-91B1-11D0-9484-00A0C91110ED}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{5DE7A180-91B1-11D0-9484-00A0C91110ED}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}\InprocServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\39e0e99686f3ff4871a53ab3700bd7e5b0fa9a1de1eb9fd90b9be77eb1bc5483.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{E675F3F0-91B5-11D0-9484-00A0C91110ED}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E675F3F0-91B5-11D0-9484-00A0C91110ED}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}\TypeLib\ = "{6B263850-900B-11D0-9484-00A0C91110ED}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2B11E9B0-9F09-11D0-9484-00A0C91110ED}\VersionIndependentProgID\ = "MSSTDFMT.StdDataValue"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2B11E9B0-9F09-11D0-9484-00A0C91110ED}\ProgID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataFormats\CLSID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataFormats\CLSID\ = "{99FF4677-FFC3-11D0-BD02-00C04FC2FB86}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D835690-900B-11D0-9484-00A0C91110ED}\ = "StdDataFormat Object"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSSTDFMT.StdDataFormat.1\CLSID\ = "{6D835690-900B-11D0-9484-00A0C91110ED}"	regsvr32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

regsvr32mgr.exe

description pid process

Token: SeDebugPrivilege 732 regsvr32mgr.exe

description	pid	process
Token: SeDebugPrivilege	732	regsvr32mgr.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

regsvr32.exeregsvr32.exe

description	pid	process	target process
PID 4964 wrote to memory of 4548	4964	regsvr32.exe	regsvr32.exe
PID 4964 wrote to memory of 4548	4964	regsvr32.exe	regsvr32.exe
PID 4964 wrote to memory of 4548	4964	regsvr32.exe	regsvr32.exe
PID 4548 wrote to memory of 732	4548	regsvr32.exe	regsvr32mgr.exe
PID 4548 wrote to memory of 732	4548	regsvr32.exe	regsvr32mgr.exe
PID 4548 wrote to memory of 732	4548	regsvr32.exe	regsvr32mgr.exe

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\39e0e99686f3ff4871a53ab3700bd7e5b0fa9a1de1eb9fd90b9be77eb1bc5483.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:4964
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\39e0e99686f3ff4871a53ab3700bd7e5b0fa9a1de1eb9fd90b9be77eb1bc5483.dll
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:4548
- - C:\Windows\SysWOW64\regsvr32mgr.exe
    C:\Windows\SysWOW64\regsvr32mgr.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:732
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 732 -s 384
      4⤵
      Program crash
      PID:876

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 732 -ip 732
1⤵
PID:3408

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

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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/732-4-0x0000000000400000-0x000000000045B000-memory.dmp

Filesize
364KB

Download
memory/732-10-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/732-12-0x00000000006E0000-0x00000000006E1000-memory.dmp

Filesize
4KB

Download
memory/732-16-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/732-15-0x0000000000400000-0x000000000045B000-memory.dmp

Filesize
364KB

Download
memory/4548-0-0x0000000024DD0000-0x0000000024E1A000-memory.dmp

Filesize
296KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads