Malware Analysis Report

2025-01-02 07:32

Sample ID 240815-syylwsyhjf
Target 6639540418063f3317b273d87be5fa90N.exe
SHA256 4178834695d7a474e0f32c4460e6df08382b5db972bad15704453d0a3cd621e2
Tags
floxif backdoor discovery persistence privilege_escalation trojan upx
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

4178834695d7a474e0f32c4460e6df08382b5db972bad15704453d0a3cd621e2

Threat Level: Known bad

The file 6639540418063f3317b273d87be5fa90N.exe was found to be: Known bad.

Malicious Activity Summary

floxif backdoor discovery persistence privilege_escalation trojan upx

Floxif, Floodfix

Detects Floxif payload

Event Triggered Execution: AppInit DLLs

Loads dropped DLL

Executes dropped EXE

ACProtect 1.3x - 1.4x DLL software

UPX packed file

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 WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-15 15:32

Signatures

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-15 15:32

Reported

2024-08-15 15:34

Platform

win10v2004-20240802-en

Max time kernel

104s

Max time network

104s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe"

Signatures

Floxif, Floodfix

backdoor trojan floxif

Detects Floxif payload

backdoor
Description Indicator Process Target
N/A N/A N/A N/A

Event Triggered Execution: AppInit DLLs

persistence privilege_escalation

ACProtect 1.3x - 1.4x DLL software

Description Indicator Process Target
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A \??\c:\temp\ext36642\hotfix.exe N/A

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\b: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\e: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\g: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\k: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\p: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\s: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\t: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\a: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\y: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\l: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\n: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\r: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\w: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\h: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\x: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\o: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\j: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\m: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\q: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\u: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\v: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\z: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\i: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files\Common Files\System\symsrv.dll C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File created \??\c:\program files\common files\system\symsrv.dll.000 C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language \??\c:\temp\ext36642\hotfix.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
Token: SeDebugPrivilege N/A \??\c:\temp\ext36642\hotfix.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe

"C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe"

\??\c:\temp\ext36642\hotfix.exe

c:\temp\ext36642\hotfix.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 5isohu.com udp
US 8.8.8.8:53 www.aieov.com udp
US 45.33.23.183:80 www.aieov.com tcp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 183.23.33.45.in-addr.arpa udp
US 8.8.8.8:53 5isohu.com udp
US 45.33.23.183:80 www.aieov.com tcp
US 8.8.8.8:53 5isohu.com udp
US 45.33.23.183:80 www.aieov.com tcp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp

Files

memory/1372-0-0x0000000005000000-0x0000000005018000-memory.dmp

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

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/1372-5-0x0000000010000000-0x0000000010030000-memory.dmp

memory/1372-9-0x0000000005000000-0x0000000005018000-memory.dmp

memory/1372-7-0x0000000005001000-0x0000000005002000-memory.dmp

C:\temp\ext36642\hotfix.exe

MD5 e1f9e0c91d35efd132f08aa53af8ed6c
SHA1 c129eff999749dad700460e8f0d799d0c7863214
SHA256 0451e69d256acf67745c3918180c0d376a1cbee803951cd57c48e289b5b6a4ae
SHA512 6883b7336a5c6c67e43849fa009b6a6d5a95b8b2a3490e306255aa3b809f567953233912a04138c2844864d8348a321da4ee895d3349ed1fd8bbb091c06cf353

memory/3236-26-0x0000000010000000-0x0000000010030000-memory.dmp

\??\c:\temp\ext36642\hotfix.inf

MD5 639176bb485ffed1372c6f6b290c00cd
SHA1 92a71862ce7564f92a1b00fd988191e4bbf13175
SHA256 2a2f1a38a91fe63ca0023413fc0e2d81aeb86e7bb811a7be114dd2f995e2523e
SHA512 83904cdf44b04454021f25b745d2b1292c69fe710d1457104ce3b011c0e025c34110015e39274227d3e177b59f8c7ece5b52d83b3ddaa2ed6b70963cfc5de043

C:\temp\ext36642\hotfix.exe.tmp

MD5 7eefbd204e91845511210f64b6b2d229
SHA1 1ef06b7d684dbc890e6ffa545430295ed92f59a7
SHA256 8592495243340af9d21e096eea78e1cfe9d1b00a81e3bcbc866754c866f40e25
SHA512 6e821bf3c6241ac29027b0e433c49f4819cf00ecf5ebdc2325c37ba6f6e9b2a3f5143046bf32f36c3e386ffbbb36315c2ae7512d2f4bee796bac871be989059f

memory/1372-35-0x0000000005000000-0x0000000005018000-memory.dmp

memory/1372-38-0x0000000010000000-0x0000000010030000-memory.dmp

memory/1372-39-0x0000000005001000-0x0000000005002000-memory.dmp

memory/1372-40-0x0000000010000000-0x0000000010030000-memory.dmp

memory/3236-41-0x0000000010000000-0x0000000010030000-memory.dmp

memory/3236-46-0x0000000010000000-0x0000000010030000-memory.dmp

memory/1372-55-0x0000000005000000-0x0000000005018000-memory.dmp

memory/1372-56-0x0000000010000000-0x0000000010030000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-15 15:32

Reported

2024-08-15 15:34

Platform

win7-20240704-en

Max time kernel

13s

Max time network

19s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe"

Signatures

Floxif, Floodfix

backdoor trojan floxif

Detects Floxif payload

backdoor
Description Indicator Process Target
N/A N/A N/A N/A

ACProtect 1.3x - 1.4x DLL software

Description Indicator Process Target
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A \??\c:\temp\ext36642\hotfix.exe N/A

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\e: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\j: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\n: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\w: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\z: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\g: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\r: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\s: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\o: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\x: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\b: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\h: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\k: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\m: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\p: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\q: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\t: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\u: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\a: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\i: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\l: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\v: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File opened (read-only) \??\y: C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files\Common Files\System\symsrv.dll C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
File created \??\c:\program files\common files\system\symsrv.dll.000 C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language \??\c:\temp\ext36642\hotfix.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe N/A
Token: SeRestorePrivilege N/A \??\c:\temp\ext36642\hotfix.exe N/A
Token: SeRestorePrivilege N/A \??\c:\temp\ext36642\hotfix.exe N/A
Token: SeRestorePrivilege N/A \??\c:\temp\ext36642\hotfix.exe N/A
Token: SeRestorePrivilege N/A \??\c:\temp\ext36642\hotfix.exe N/A
Token: SeRestorePrivilege N/A \??\c:\temp\ext36642\hotfix.exe N/A
Token: SeRestorePrivilege N/A \??\c:\temp\ext36642\hotfix.exe N/A
Token: SeRestorePrivilege N/A \??\c:\temp\ext36642\hotfix.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe

"C:\Users\Admin\AppData\Local\Temp\6639540418063f3317b273d87be5fa90N.exe"

\??\c:\temp\ext36642\hotfix.exe

c:\temp\ext36642\hotfix.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 5isohu.com udp
US 8.8.8.8:53 www.aieov.com udp
US 72.14.185.43:80 www.aieov.com tcp

Files

memory/676-0-0x0000000005000000-0x0000000005018000-memory.dmp

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

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/676-4-0x0000000010000000-0x0000000010030000-memory.dmp

memory/676-6-0x0000000005001000-0x0000000005002000-memory.dmp

memory/676-9-0x0000000005000000-0x0000000005018000-memory.dmp

\temp\ext36642\hotfix.exe

MD5 e1f9e0c91d35efd132f08aa53af8ed6c
SHA1 c129eff999749dad700460e8f0d799d0c7863214
SHA256 0451e69d256acf67745c3918180c0d376a1cbee803951cd57c48e289b5b6a4ae
SHA512 6883b7336a5c6c67e43849fa009b6a6d5a95b8b2a3490e306255aa3b809f567953233912a04138c2844864d8348a321da4ee895d3349ed1fd8bbb091c06cf353

\??\c:\temp\ext36642\hotfix.inf

MD5 639176bb485ffed1372c6f6b290c00cd
SHA1 92a71862ce7564f92a1b00fd988191e4bbf13175
SHA256 2a2f1a38a91fe63ca0023413fc0e2d81aeb86e7bb811a7be114dd2f995e2523e
SHA512 83904cdf44b04454021f25b745d2b1292c69fe710d1457104ce3b011c0e025c34110015e39274227d3e177b59f8c7ece5b52d83b3ddaa2ed6b70963cfc5de043

C:\temp\ext36642\hotfix.exe.tmp

MD5 27769ab09f7b16ea958b71aa772ffc58
SHA1 6809c31a9d194498d39365f32613e43c59766537
SHA256 a746d38dc99564420fd176714d69016f820c413db947eae29e37be5c261f0d84
SHA512 e7a702f099ba986cf2d11ebfc522f5401a17271871b8543f87fac07afbffa42d7593cccfb1fb52e4527829bd5e1370249360067d474e283ddd64b4b2e6d918c2

memory/676-37-0x0000000010000000-0x0000000010030000-memory.dmp

memory/676-38-0x0000000005001000-0x0000000005002000-memory.dmp

memory/676-39-0x0000000005000000-0x0000000005018000-memory.dmp

memory/2728-41-0x0000000001000000-0x000000000103F000-memory.dmp

memory/2728-42-0x0000000001000000-0x000000000103F000-memory.dmp

memory/676-49-0x0000000010000000-0x0000000010030000-memory.dmp

memory/676-50-0x0000000005000000-0x0000000005018000-memory.dmp