c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583

Analysis

max time kernel
148s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
13-02-2024 05:10

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General

Target

c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe
Size

4.4MB
MD5

9631809ff9e66cc5809e51e2929dfbe8
SHA1

4ee1085393d94978fc17b1453517f0aa7f40b8a3
SHA256

c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583
SHA512

3e350e41e7a86756438762c0a6772e5781757bb941e8c88c58238e1f19e15a3eb743301119050b30476d69bc68568a0bad1cdd4560f1ecac2cf4c0c72c9d77d1
SSDEEP

98304:k8sjkFhRWieWT0ywsagZ9VeXD3qJJXg2cMUGZWh:2jyhRPeWvnzwrivWh

Score

9^/10

upx

Malware Config

Signatures

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/files/0x0006000000023207-6.dat	UPX
behavioral2/files/0x0006000000023207-7.dat	UPX
behavioral2/memory/956-8-0x0000000000400000-0x0000000000623000-memory.dmp	UPX
behavioral2/memory/956-71-0x0000000000400000-0x0000000000623000-memory.dmp	UPX

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	WindowsLoader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	WindowsLoader.exe

Executes dropped EXE 1 IoCs

pid	Process
956	WindowsLoader.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0006000000023207-6.dat	upx
behavioral2/files/0x0006000000023207-7.dat	upx
behavioral2/memory/956-8-0x0000000000400000-0x0000000000623000-memory.dmp	upx
behavioral2/memory/956-71-0x0000000000400000-0x0000000000623000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key created	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	WindowsLoader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\BaseBoardProduct	WindowsLoader.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
956	WindowsLoader.exe
956	WindowsLoader.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: 33	956	WindowsLoader.exe
Token: SeIncBasePriorityPrivilege	956	WindowsLoader.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
956	WindowsLoader.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1532 wrote to memory of 956	1532	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	84
PID 1532 wrote to memory of 956	1532	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	84
PID 1532 wrote to memory of 956	1532	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	84

C:\Users\Admin\AppData\Local\Temp\c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe
"C:\Users\Admin\AppData\Local\Temp\c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1532
- C:\Users\Admin\AppData\Local\Temp\WindowsLoader.exe
  C:\Users\Admin\AppData\Local\Temp\WindowsLoader.exe
  2⤵
  - Checks BIOS information in registry
  - Executes dropped EXE
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  PID:956

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\WindowsLoader.exe

Filesize
2.1MB

MD5
b8bb5b4bb8d0948eade0cdf12c16f5b6

SHA1
03f8413f2eeffcb4144bcb6fa60a2d1a2dc2b4ce

SHA256
8ef25e4ab7cce321c3a37a56c22297c55963d10f34ad3f2a494e7a220e6294dd

SHA512
5e461682c20ee2c9b6329780fd434088febdf34d040d7f616076fc7f1f9f75a3789054f5b916a34c94339714bdebd5194e2828be5451cd6a04fea58e681120b6

Download Submit
C:\Users\Admin\AppData\Local\Temp\WindowsLoader.exe

Filesize
1.6MB

MD5
18a6a126d56739fd4e5ea87f19f749b0

SHA1
49acbf6a7b26d9deeef3c9935aa5c6a701bdb51c

SHA256
9340c64f90f0c8cec0120ebfc4d3b826fc58446177492531353572b34229b80a

SHA512
fcb0e82d39df186d325391e9444a1dc48607c4c0a570669a8feaef7cf87bf00ab8e3ea0ef516322eb0767407f90962e392e2c73a94adf1a9af7a6a5e282c368a

Download Submit
memory/956-8-0x0000000000400000-0x0000000000623000-memory.dmp

Filesize
2.1MB

Download
memory/956-9-0x0000000002A90000-0x0000000002AA3000-memory.dmp

Filesize
76KB

Download
memory/956-11-0x0000000002550000-0x00000000026F3000-memory.dmp

Filesize
1.6MB

Download
memory/956-18-0x0000000002420000-0x0000000002430000-memory.dmp

Filesize
64KB

Download
memory/956-23-0x0000000002AB0000-0x0000000002AC2000-memory.dmp

Filesize
72KB

Download
memory/956-31-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/956-39-0x0000000002E10000-0x0000000002E21000-memory.dmp

Filesize
68KB

Download
memory/956-47-0x0000000002E30000-0x0000000002E40000-memory.dmp

Filesize
64KB

Download
memory/956-55-0x0000000002E40000-0x0000000002E50000-memory.dmp

Filesize
64KB

Download
memory/956-63-0x0000000002E50000-0x0000000002E70000-memory.dmp

Filesize
128KB

Download
memory/956-71-0x0000000000400000-0x0000000000623000-memory.dmp

Filesize
2.1MB

Download