854d008726bdfd7d6edcae33507293ae358190479318d3a1a48ffb92b5457e8d

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
07/03/2024, 03:11

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General

Target

b5b84fa10836de9aa91ce48312dfbf9c.exe
Size

49KB
MD5

b5b84fa10836de9aa91ce48312dfbf9c
SHA1

fc2e15061f270f51c5bf7afc02ccadb43fbfc1ff
SHA256

854d008726bdfd7d6edcae33507293ae358190479318d3a1a48ffb92b5457e8d
SHA512

0200db25d809fb83e0d7814d47da6f3c85ad005570cc949dc1f43b9f6a1181eec804bdb9ae2270620d85ebf1234c0ddc9f8c22831d2d7b0a6f008820a01ad113
SSDEEP

768:Pw+wlBHIOzRg6/kTHpQmaeVE4lyViQp+BHrk8QP8DDkyZZb+t02cBM8Vp+TWoEYr:Pw+OiOq6BeCSdQpsHrkYDVZaaBMBSYjf

Score

7^/10

persistence upx

Malware Config

Signatures

Loads dropped DLL 2 IoCs

pid	Process
3416	b5b84fa10836de9aa91ce48312dfbf9c.exe
4784	rundll32.exe

UPX packed file 11 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3416-1-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/3416-2-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/3416-4-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/3416-10-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/3416-12-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/3416-14-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/3416-16-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/4784-31-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/4784-33-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/4784-34-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/4784-36-0x0000000010000000-0x0000000010014000-memory.dmp	upx

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\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\MSServer = "rundll32.exe C:\\Windows\\system32\\tuvSkHya.dll,#1"	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\rqRJBQkH.dll	b5b84fa10836de9aa91ce48312dfbf9c.exe
File created	C:\Windows\SysWOW64\rqRJBQkH.dll	b5b84fa10836de9aa91ce48312dfbf9c.exe
File created	C:\Windows\SysWOW64\tuvSkHya.dll	b5b84fa10836de9aa91ce48312dfbf9c.exe
File opened for modification	C:\Windows\SysWOW64\tuvSkHya.dll	b5b84fa10836de9aa91ce48312dfbf9c.exe

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{DD153FDB-E2FB-40D2-8E36-F21C36B51DAD}\InprocServer32\ThreadingModel = "Both"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{DD153FDB-E2FB-40D2-8E36-F21C36B51DAD}	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{DD153FDB-E2FB-40D2-8E36-F21C36B51DAD}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{DD153FDB-E2FB-40D2-8E36-F21C36B51DAD}\InprocServer32\ = "C:\\Windows\\SysWow64\\tuvSkHya.dll"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3416	b5b84fa10836de9aa91ce48312dfbf9c.exe
3416	b5b84fa10836de9aa91ce48312dfbf9c.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe
4784	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3416	b5b84fa10836de9aa91ce48312dfbf9c.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3416	b5b84fa10836de9aa91ce48312dfbf9c.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 3416 wrote to memory of 628	3416	b5b84fa10836de9aa91ce48312dfbf9c.exe	5
PID 3416 wrote to memory of 4784	3416	b5b84fa10836de9aa91ce48312dfbf9c.exe	100
PID 3416 wrote to memory of 4784	3416	b5b84fa10836de9aa91ce48312dfbf9c.exe	100
PID 3416 wrote to memory of 4784	3416	b5b84fa10836de9aa91ce48312dfbf9c.exe	100
PID 3416 wrote to memory of 4928	3416	b5b84fa10836de9aa91ce48312dfbf9c.exe	101
PID 3416 wrote to memory of 4928	3416	b5b84fa10836de9aa91ce48312dfbf9c.exe	101
PID 3416 wrote to memory of 4928	3416	b5b84fa10836de9aa91ce48312dfbf9c.exe	101

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:628

C:\Users\Admin\AppData\Local\Temp\b5b84fa10836de9aa91ce48312dfbf9c.exe
"C:\Users\Admin\AppData\Local\Temp\b5b84fa10836de9aa91ce48312dfbf9c.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3416
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Windows\system32\tuvSkHya.dll,a
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  PID:4784
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Local\Temp\removalfile.bat "C:\Users\Admin\AppData\Local\Temp\b5b84fa10836de9aa91ce48312dfbf9c.exe"
  2⤵
  PID:4928

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\removalfile.bat

Filesize
43B

MD5
9a7ef09167a6f4433681b94351509043

SHA1
259b1375ed8e84943ca1d42646bb416325c89e12

SHA256
d5739a0510d89da572eb0b0d394d4fb4dd361cd9ee0144b9b31c590df93c3be7

SHA512
96b84cd88a0e4b7c1122af3ed6ce5edf0a9a4e9bf79575eadfac16b2c46f1278d57755d29f21d7c6dcb4403be24b7ac7da4837c6cc9c602342a8f2b8e54883df

Download Submit
C:\Windows\SysWOW64\rqRJBQkH.dll

Filesize
32KB

MD5
4c5bf9225bd98663f23727340bc44bdd

SHA1
ef498e4e61c0f814864937d97c34e744f99d9908

SHA256
0c17cf77bcec171e7e887aeebf413080979d89cec066a1b61ba75fe08324740c

SHA512
8d397cb4c45a15fe5a53927bb2fba43b58ba5cfde28ef28a9b11cfcb4ff13ad50bbbd7e72190d05960225a2b188028bc52a94a36745909a5899fdf3a96b1409b

Download Submit
memory/3416-13-0x0000000002190000-0x0000000002196000-memory.dmp

Filesize
24KB

Download
memory/3416-14-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/3416-4-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/3416-2-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/3416-10-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/3416-12-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/3416-0-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/3416-3-0x0000000000420000-0x000000000042B000-memory.dmp

Filesize
44KB

Download
memory/3416-16-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/3416-1-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/4784-32-0x0000000000D50000-0x0000000000D56000-memory.dmp

Filesize
24KB

Download
memory/4784-33-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/4784-34-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/4784-31-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/4784-36-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/4784-38-0x0000000000D50000-0x0000000000D56000-memory.dmp

Filesize
24KB

Download