1174995b7eca1869929bbc8026d17bb60cfa8310a570bd5611908caca15deead

Analysis

max time kernel
144s
max time network
166s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
06-01-2024 10:50

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General

Target

45af3ee5c1252a150d1652574d6da322.exe
Size

83KB
MD5

45af3ee5c1252a150d1652574d6da322
SHA1

d28c518df33624496514f7ecdc16ffdf7ee19a26
SHA256

1174995b7eca1869929bbc8026d17bb60cfa8310a570bd5611908caca15deead
SHA512

e3554bddd6cccfd695583785356548dad0679efea9ded6a6f6eec481a378c4f9eb93ce50cb77bb0eeb53f8e76a5daed9eb7ba40d60a1de4614bbb62ef5461430
SSDEEP

1536:+ocEVv0azBsFgr4NYLrAA73xJKLMWngDKVeJqlTuo:7cGeyL/nKHngDKVeJqlSo

Score

10^/10

evasion persistence

Malware Config

Signatures

Modifies firewall policy service 2 TTPs 4 IoCs

evasion

Modify Registry

T1112

Windows Service

T1543.003

Processes:

klass.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications	klass.exe
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\C:\Program Files (x86)\Common Files\System\klass.exe = "C:\\Program Files (x86)\\Common Files\\System\\klass.exe:*:Enabled:Windows Update"	klass.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List	klass.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile	klass.exe

Executes dropped EXE 1 IoCs

Processes:

klass.exe

pid	Process
64	klass.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

klass.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Windows Update = "C:\\Program Files (x86)\\Common Files\\System\\klass.exe"	klass.exe

Drops file in Program Files directory 6 IoCs

Processes:

klass.exe45af3ee5c1252a150d1652574d6da322.exe

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\System\klass.exe	klass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System	45af3ee5c1252a150d1652574d6da322.exe
File created	C:\Program Files (x86)\Common Files\System\klass.exe	45af3ee5c1252a150d1652574d6da322.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\klass.exe	45af3ee5c1252a150d1652574d6da322.exe
File opened for modification	C:\Program Files (x86)\Common Files\System	klass.exe
File created	C:\Program Files (x86)\Common Files\System\klass.exe	klass.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

45af3ee5c1252a150d1652574d6da322.exe

description	pid	Process	procid_target
PID 2640 wrote to memory of 64	2640	45af3ee5c1252a150d1652574d6da322.exe	92
PID 2640 wrote to memory of 64	2640	45af3ee5c1252a150d1652574d6da322.exe	92
PID 2640 wrote to memory of 64	2640	45af3ee5c1252a150d1652574d6da322.exe	92

C:\Users\Admin\AppData\Local\Temp\45af3ee5c1252a150d1652574d6da322.exe
"C:\Users\Admin\AppData\Local\Temp\45af3ee5c1252a150d1652574d6da322.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:2640
- C:\Program Files (x86)\Common Files\System\klass.exe
  "C:\Program Files (x86)\Common Files\System\klass.exe"
  2⤵
  - Modifies firewall policy service
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in Program Files directory
  PID:64

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

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\Common Files\System\klass.exe

Filesize
83KB

MD5
45af3ee5c1252a150d1652574d6da322

SHA1
d28c518df33624496514f7ecdc16ffdf7ee19a26

SHA256
1174995b7eca1869929bbc8026d17bb60cfa8310a570bd5611908caca15deead

SHA512
e3554bddd6cccfd695583785356548dad0679efea9ded6a6f6eec481a378c4f9eb93ce50cb77bb0eeb53f8e76a5daed9eb7ba40d60a1de4614bbb62ef5461430

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