5d93b84bf2d6519a5b7ba45e27d9d014106f19102df7281fa58a0ee081f68724

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
02/02/2024, 23:21

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General

Target

8aca73a0d688b7c3b555dbb5799dba92.exe
Size

16KB
MD5

8aca73a0d688b7c3b555dbb5799dba92
SHA1

565bafc4bf770d10c3bcfd1f5ed2b24194b35253
SHA256

5d93b84bf2d6519a5b7ba45e27d9d014106f19102df7281fa58a0ee081f68724
SHA512

06387990bc2583b9715a0e71d08feffe4db4f81cb984c7262005bce67ea4c0f91c556b533e875906550c6938b07d68c004b543063fe750da4c0b5951fef7fb57
SSDEEP

384:gqmhgzhZvetCeBcfWiIrcDxn2RV+kBo6p:gqEeZvetNBcxDI3o6p

Score

10^/10

persistence upx

Malware Config

Signatures

Adds autorun key to be loaded by Explorer.exe on startup 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\ShellServiceObjectDelayLoad\rpxlvzvs.dll = "{71A78CD4-E470-4a18-8457-E0E0283DD507}"	8aca73a0d688b7c3b555dbb5799dba92.exe

Deletes itself 1 IoCs

pid	Process
2816	cmd.exe

Loads dropped DLL 1 IoCs

pid	Process
2844	8aca73a0d688b7c3b555dbb5799dba92.exe

UPX packed file 2 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2844-0-0x0000000000400000-0x000000000040D000-memory.dmp	upx
behavioral1/memory/2844-13-0x0000000000400000-0x000000000040D000-memory.dmp	upx

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\rpxlvzvs.nls	8aca73a0d688b7c3b555dbb5799dba92.exe
File created	C:\Windows\SysWOW64\rpxlvzvs.tmp	8aca73a0d688b7c3b555dbb5799dba92.exe
File opened for modification	C:\Windows\SysWOW64\rpxlvzvs.tmp	8aca73a0d688b7c3b555dbb5799dba92.exe

Modifies registry class 4 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{71A78CD4-E470-4a18-8457-E0E0283DD507}	8aca73a0d688b7c3b555dbb5799dba92.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{71A78CD4-E470-4a18-8457-E0E0283DD507}\InProcServer32	8aca73a0d688b7c3b555dbb5799dba92.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{71A78CD4-E470-4a18-8457-E0E0283DD507}\InProcServer32\ = "C:\\Windows\\SysWow64\\rpxlvzvs.dll"	8aca73a0d688b7c3b555dbb5799dba92.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{71A78CD4-E470-4a18-8457-E0E0283DD507}\InProcServer32\ThreadingModel = "Apartment"	8aca73a0d688b7c3b555dbb5799dba92.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2844	8aca73a0d688b7c3b555dbb5799dba92.exe
2844	8aca73a0d688b7c3b555dbb5799dba92.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2844	8aca73a0d688b7c3b555dbb5799dba92.exe
2844	8aca73a0d688b7c3b555dbb5799dba92.exe
2844	8aca73a0d688b7c3b555dbb5799dba92.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2844 wrote to memory of 2816	2844	8aca73a0d688b7c3b555dbb5799dba92.exe	28
PID 2844 wrote to memory of 2816	2844	8aca73a0d688b7c3b555dbb5799dba92.exe	28
PID 2844 wrote to memory of 2816	2844	8aca73a0d688b7c3b555dbb5799dba92.exe	28
PID 2844 wrote to memory of 2816	2844	8aca73a0d688b7c3b555dbb5799dba92.exe	28

C:\Users\Admin\AppData\Local\Temp\8aca73a0d688b7c3b555dbb5799dba92.exe
"C:\Users\Admin\AppData\Local\Temp\8aca73a0d688b7c3b555dbb5799dba92.exe"
1⤵
- Adds autorun key to be loaded by Explorer.exe on startup
- Loads dropped DLL
- Drops file in System32 directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2844
- C:\Windows\SysWOW64\cmd.exe
  cmd /c C:\Users\Admin\AppData\Local\Temp\8891.tmp.bat
  2⤵
  - Deletes itself
  PID:2816

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\8891.tmp.bat

Filesize
179B

MD5
6bba2557b229eee6673612d2f56a66c9

SHA1
2b89d7fefaf165462ebacb3c19bf4815c6d6fe7f

SHA256
a687d652b31bda58e11a652f61e09c8c6fc00295e1947fb1e10ad5011dddcf3c

SHA512
93436c3568a14f76775626986a154b14da7eef9ef9384a122977e20b16033ddcfd175d0a93fc005435ef8d1b410973697ca5e557f77b000d8137624eef8bcfd2

Download Submit
\Windows\SysWOW64\rpxlvzvs.dll

Filesize
2.3MB

MD5
f923c1f8835616ed98f0e01ef13dd2ce

SHA1
3029f2d6ff0713b66e05db313228afa7584271f1

SHA256
2bc449c33576e0b044f37a55e10cb504ce428fd3de4e31dac7d7bdc86c4dbf16

SHA512
0e43ee260e1cbad41f72b74bc89c23d2b5ec6b085db2879e5cc895afc9695186c4dacaab612b80b00266f2772352e9439ae805d46c134f0bc74baa43faf3b52b

Download Submit
memory/2844-0-0x0000000000400000-0x000000000040D000-memory.dmp

Filesize
52KB

Download
memory/2844-14-0x0000000010000000-0x0000000010008000-memory.dmp

Filesize
32KB

Download
memory/2844-13-0x0000000000400000-0x000000000040D000-memory.dmp

Filesize
52KB

Download
memory/2844-25-0x0000000010000000-0x0000000010008000-memory.dmp

Filesize
32KB

Download