22503a27c8bd1299e67f484b0c750276323d5a97b9dd45e1da7a935fe377ec1e

Resubmissions

02-08-2024 16:33

240802-t2wr5s1eqj 10

Analysis

max time kernel
150s
max time network
148s
platform
windows11-21h2_x64
resource
win11-20240802-en
resource tags

arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
submitted
02-08-2024 16:33

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General

Target

Fallen.exe
Size

11KB
MD5

1423f94092ba6a80ec571748e08d396e
SHA1

3839e76d9f01f9a92304cab21aa130f5800f71d2
SHA256

f595233fa17f4f280bd88b012419652b8d11f086ccc497ab5c796eba39498e60
SHA512

197fb512e2ee4d4cd3bf499e70a1ffda8e107efc6e6a354622448b7dac575701d6f2288df97db568df7e27e780750bc4c3337ffc869adffbd21b013c69aba18f
SSDEEP

192:lWSZPpGh+GERpCJv+A3zBEZJ/zauVGBch+OLK72Qeo9cfFBKCJ8N:EyPpoUCJv+G9En/zauVy0+372QB9YJU

Score

7^/10

discovery upx

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

Server.exe

pid process

1028 Server.exe

pid	process
1028	Server.exe

UPX packed file 17 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/432-0-0x0000000000400000-0x0000000000409000-memory.dmp	upx
C:\Windows\Server.exe	upx
behavioral2/memory/432-4-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-5-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-6-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-7-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-8-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-9-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-10-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-11-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-12-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-13-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-14-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-15-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-16-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-17-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/1028-18-0x0000000000400000-0x0000000000409000-memory.dmp	upx

Drops file in Windows directory 2 IoCs

Processes:

Fallen.exe

description ioc process

File created C:\Windows\Server.exe Fallen.exe
File opened for modification C:\Windows\Server.exe Fallen.exe

description	ioc	process
File created	C:\Windows\Server.exe	Fallen.exe
File opened for modification	C:\Windows\Server.exe	Fallen.exe

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

Fallen.exeServer.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Fallen.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Server.exe

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

Server.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	Server.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	Server.exe

Suspicious behavior: RenamesItself 1 IoCs

Processes:

Fallen.exe

pid process

432 Fallen.exe

pid	process
432	Fallen.exe

C:\Users\Admin\AppData\Local\Temp\Fallen.exe
"C:\Users\Admin\AppData\Local\Temp\Fallen.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: RenamesItself
PID:432

C:\Windows\Server.exe
C:\Windows\Server.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Checks processor information in registry
PID:1028

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Windows\Server.exe
Filesize
11KB

MD5
1423f94092ba6a80ec571748e08d396e

SHA1
3839e76d9f01f9a92304cab21aa130f5800f71d2

SHA256
f595233fa17f4f280bd88b012419652b8d11f086ccc497ab5c796eba39498e60

SHA512
197fb512e2ee4d4cd3bf499e70a1ffda8e107efc6e6a354622448b7dac575701d6f2288df97db568df7e27e780750bc4c3337ffc869adffbd21b013c69aba18f

Download Submit
memory/432-0-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/432-4-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-10-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-12-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-7-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-8-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-9-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-5-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-11-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-6-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-13-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-14-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-15-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-16-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-17-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1028-18-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download