floxif | 1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3

General

Target

1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
Size

740KB
MD5

bf0886b266d36fc2d2b477699b2d8500
SHA1

c2165705f43dc1b9e79f7664460b8c66fbdc8fbf
SHA256

1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3
SHA512

b1e036dfb4cddc38eff1aa3080db87ff193f95b33bc0a12af5b8decb25ba50cfcade2f0d511eb6bd8a2921b601984b4cff6c7adf995e217836cd7a601365e4da
SSDEEP

12288:DTyjXW+48qWywrU4kGFezOwsuJ5PIiww7F5DO3HYffnBjvrEH7u:fIXW/8yw1ezdlIsF5SXYHlrEH7u

Score

10^/10

floxif backdoor discovery evasion persistence 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

Modifies visibility of file extensions in Explorer 2 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideFileExt = "1"	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	rundll32.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe

Detects Floxif payload 1 IoCs

backdoor

resource	yara_rule
behavioral1/files/0x000b000000012029-1.dat	floxif

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral1/files/0x000b000000012029-1.dat	acprotect

Executes dropped EXE 1 IoCs

pid	Process
2564	rundll32.exe

Loads dropped DLL 3 IoCs

pid	Process
2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
2564	rundll32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft Windows = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Office\\rundll32.exe"	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe

Enumerates connected drives 3 TTPs 25 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)	\??\Z:	rundll32.exe
File opened (read-only)	\??\E:	rundll32.exe
File opened (read-only)	\??\L:	rundll32.exe
File opened (read-only)	\??\N:	rundll32.exe
File opened (read-only)	\??\Q:	rundll32.exe
File opened (read-only)	\??\R:	rundll32.exe
File opened (read-only)	\??\U:	rundll32.exe
File opened (read-only)	\??\X:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\A:	rundll32.exe
File opened (read-only)	\??\H:	rundll32.exe
File opened (read-only)	\??\I:	rundll32.exe
File opened (read-only)	\??\J:	rundll32.exe
File opened (read-only)	\??\K:	rundll32.exe
File opened (read-only)	\??\P:	rundll32.exe
File opened (read-only)	\??\e:	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
File opened (read-only)	\??\M:	rundll32.exe
File opened (read-only)	\??\O:	rundll32.exe
File opened (read-only)	\??\S:	rundll32.exe
File opened (read-only)	\??\V:	rundll32.exe
File opened (read-only)	\??\Y:	rundll32.exe
File opened (read-only)	\??\B:	rundll32.exe
File opened (read-only)	\??\G:	rundll32.exe
File opened (read-only)	\??\T:	rundll32.exe
File opened (read-only)	\??\W:	rundll32.exe

UPX packed file 11 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000b000000012029-1.dat	upx
behavioral1/memory/2012-3-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2564-21-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2012-18-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2564-26-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2564-27-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2564-30-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2564-33-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2564-36-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2564-39-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2564-42-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
File created	\??\c:\program files\common files\system\symsrv.dll.000	rundll32.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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
Token: SeDebugPrivilege	2564	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
2564	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2012 wrote to memory of 2564	2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe	30
PID 2012 wrote to memory of 2564	2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe	30
PID 2012 wrote to memory of 2564	2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe	30
PID 2012 wrote to memory of 2564	2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe	30
PID 2012 wrote to memory of 2564	2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe	30
PID 2012 wrote to memory of 2564	2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe	30
PID 2012 wrote to memory of 2564	2012	1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe	30

C:\Users\Admin\AppData\Local\Temp\1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe
"C:\Users\Admin\AppData\Local\Temp\1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3N.exe"
1⤵
- Modifies visibility of file extensions in Explorer
- Modifies visiblity of hidden/system files in Explorer
- Loads dropped DLL
- Adds Run key to start application
- Enumerates connected drives
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2012
- C:\Users\Admin\AppData\Roaming\Microsoft\Office\rundll32.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Office\rundll32.exe
  2⤵
  - Modifies visiblity of hidden/system files in Explorer
  - 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
  - Suspicious use of SetWindowsHookEx
  PID:2564

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

Modify Registry

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.000

Filesize
175B

MD5
1130c911bf5db4b8f7cf9b6f4b457623

SHA1
48e734c4bc1a8b5399bff4954e54b268bde9d54c

SHA256
eba08cc8182f379392a97f542b350ea0dbbe5e4009472f35af20e3d857eafdf1

SHA512
94e2511ef2c53494c2aff0960266491ffc0e54e75185427d1ccedae27c286992c754ca94cbb0c9ea36e3f04cd4eb7f032c551cf2d4b309f292906303f1a75fa0

Download Submit
C:\Users\Admin\AppData\Local\Temp\A1D26E2\A7C47747DC.tmp

Filesize
664KB

MD5
9f4ad2e1a21330ed5442d666e37a3b47

SHA1
af241db65197924eab63e20fd481bbdd8aafb053

SHA256
d895f7d839dedecac0558587ec722eb06ecf352399380aa6137052e1bc168783

SHA512
c9763e0c148ac7ced9263256afaae6d08de6a6b42a688df91d2faf7973ae725da9ed74cd88f1393ce6aa96e8bd227da9c0c7421af2be21427c3d102bd7018dfb

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Office\rundll32.exe

Filesize
740KB

MD5
bf0886b266d36fc2d2b477699b2d8500

SHA1
c2165705f43dc1b9e79f7664460b8c66fbdc8fbf

SHA256
1e0f60f40d567e3a71c4eaee3deea7cd3520145f35e4614d80c4433d106f99f3

SHA512
b1e036dfb4cddc38eff1aa3080db87ff193f95b33bc0a12af5b8decb25ba50cfcade2f0d511eb6bd8a2921b601984b4cff6c7adf995e217836cd7a601365e4da

Download Submit
\Program Files\Common Files\System\symsrv.dll

Filesize
67KB

MD5
7574cf2c64f35161ab1292e2f532aabf

SHA1
14ba3fa927a06224dfe587014299e834def4644f

SHA256
de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085

SHA512
4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

Download Submit
memory/2012-3-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2012-18-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2564-26-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2564-27-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2564-30-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2564-33-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2564-36-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2564-21-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2564-39-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2564-42-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads