5cf6a4ba6364654169540fc204e7f68d53aa74b61c73577213de556815f045c4

General

Target

48cefb137b69e2e659e2226a7bd5d9c0N.exe
Size

644KB
MD5

48cefb137b69e2e659e2226a7bd5d9c0
SHA1

a8b27f07c7b4a333fcaf75f937286cc764955509
SHA256

5cf6a4ba6364654169540fc204e7f68d53aa74b61c73577213de556815f045c4
SHA512

59f8c39a1b170aa7cde59d8f73c20f68022d35a0604c2d25279a9ab2eb500776c79de52ec85b9e3a7e44534e845cb9413668a6e00413808765062e4f1f1eb1b8
SSDEEP

12288:7tKe6Zv23YLVFhBsC8iFHSs7xPY1f6HriPwU8mNCZQUEsUB:v6Zv2ivhBVnFys7xP86LkRCkB

Score

8^/10

persistence upx

Malware Config

Signatures

Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\StubPath = "msyjo32.exe"	48cefb137b69e2e659e2226a7bd5d9c0N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\StubPath = "msyjo32.exe"	spoolsv.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}	48cefb137b69e2e659e2226a7bd5d9c0N.exe

Executes dropped EXE 1 IoCs

pid	Process
352	spoolsv.exe

Modifies system executable filetype association 2 TTPs 2 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	48cefb137b69e2e659e2226a7bd5d9c0N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	spoolsv.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1596-0-0x0000000000400000-0x0000000000439000-memory.dmp	upx
behavioral1/files/0x0008000000015fa3-5.dat	upx
behavioral1/files/0x0008000000015e46-12.dat	upx
behavioral1/memory/352-15-0x0000000000400000-0x0000000000439000-memory.dmp	upx
behavioral1/memory/1596-14-0x0000000000400000-0x0000000000439000-memory.dmp	upx
behavioral1/memory/352-16-0x0000000000400000-0x0000000000439000-memory.dmp	upx

Adds Run key to start application 2 TTPs 4 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\VCL = "vcl32.exe"	48cefb137b69e2e659e2226a7bd5d9c0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	48cefb137b69e2e659e2226a7bd5d9c0N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	spoolsv.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\msyjo32.exe	48cefb137b69e2e659e2226a7bd5d9c0N.exe
File created	C:\Windows\SysWOW64\concp32.exe	48cefb137b69e2e659e2226a7bd5d9c0N.exe
File opened for modification	C:\Windows\SysWOW64\concp32.exe	48cefb137b69e2e659e2226a7bd5d9c0N.exe
File created	C:\Windows\SysWOW64\vcl32.exe	48cefb137b69e2e659e2226a7bd5d9c0N.exe
File opened for modification	C:\Windows\SysWOW64\vcl32.exe	48cefb137b69e2e659e2226a7bd5d9c0N.exe
File created	C:\Windows\SysWOW64\msyjo32.exe	48cefb137b69e2e659e2226a7bd5d9c0N.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\spoolsv.exe	48cefb137b69e2e659e2226a7bd5d9c0N.exe
File opened for modification	C:\Windows\spoolsv.exe	48cefb137b69e2e659e2226a7bd5d9c0N.exe

Modifies registry class 12 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\ax = d9ec11961b00dcf6f12ecbdb67d02fda	48cefb137b69e2e659e2226a7bd5d9c0N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\u0 = 658663d26f8bad325217a06063847056939f558d910ed252e05dd0113550f7fc0f4da82ff73a0681ba604c2d4f23269f	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\v = "165"	spoolsv.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}	48cefb137b69e2e659e2226a7bd5d9c0N.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\sm = 01b8ec350471bd332433eee476ebe1f3	48cefb137b69e2e659e2226a7bd5d9c0N.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\InprocServer32	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\u1 = 551d2e0658054ba756fd3798fea5ffca42865cb762a31639dabd7f2cca44e226	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\u2 = a54a6b702f92fdf2acd57599e2ae1608015dff41aa020117fc9bd8e2dcf4340f3fa61eb55d6f28597df90602703809d4	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	spoolsv.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{99F321B7-8B9A-11D5-EBA1-F78EEEEEE983}\InprocServer32	48cefb137b69e2e659e2226a7bd5d9c0N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	48cefb137b69e2e659e2226a7bd5d9c0N.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1596	48cefb137b69e2e659e2226a7bd5d9c0N.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1596 wrote to memory of 352	1596	48cefb137b69e2e659e2226a7bd5d9c0N.exe	30
PID 1596 wrote to memory of 352	1596	48cefb137b69e2e659e2226a7bd5d9c0N.exe	30
PID 1596 wrote to memory of 352	1596	48cefb137b69e2e659e2226a7bd5d9c0N.exe	30
PID 1596 wrote to memory of 352	1596	48cefb137b69e2e659e2226a7bd5d9c0N.exe	30

C:\Users\Admin\AppData\Local\Temp\48cefb137b69e2e659e2226a7bd5d9c0N.exe
"C:\Users\Admin\AppData\Local\Temp\48cefb137b69e2e659e2226a7bd5d9c0N.exe"
1⤵
- Boot or Logon Autostart Execution: Active Setup
- Modifies system executable filetype association
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1596
- C:\Windows\spoolsv.exe
  C:\Windows\spoolsv.exe
  2⤵
  - Boot or Logon Autostart Execution: Active Setup
  - Executes dropped EXE
  - Modifies system executable filetype association
  - Adds Run key to start application
  - Modifies registry class
  PID:352

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Active Setup

1

T1547.014

Registry Run Keys / Startup Folder

1

T1547.001

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Active Setup

1

T1547.014

Registry Run Keys / Startup Folder

1

T1547.001

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Defense Evasion

Modify Registry

3

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\concp32.exe

Filesize
644KB

MD5
842bbbf6e985b83b6516881aff10a828

SHA1
f30d8f09a875fa247847c3a2a8763d773f310e0e

SHA256
69930ac5a67a2b8ca0b0f46fd92ea19f9cb580cb343dcb7a50cec3dc2c63bd46

SHA512
6896a9f9bc84f500abc7be6143ea2ff59b816f011df79c071729b1976cd0acc3f81c4976ffea219d4777c4f5cad6aafd4519f2df1867428406c4ef0662d566ae

Download Submit
C:\Windows\spoolsv.exe

Filesize
647KB

MD5
3c3b278950b89a43c37b87073c7fa879

SHA1
b5e49f6144e25c393b5f0fe39292692a3c188e23

SHA256
9fdc3602908a64c850826dc24d695b119921f620e55a1413d57b28bbe562f668

SHA512
0a7ca97de4dffa24ec7e506d8bfcff0d3a6745359434ab8e45cb35ead347eeccdd5b3ea2d008a94ba355b0cadacfb1e2bcef9bb86b32fb6ba466835533f50506

Download Submit
memory/352-15-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/352-16-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1596-0-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1596-14-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads