a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7

Analysis

max time kernel
155s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
06/12/2022, 11:37

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General

Target

a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe
Size

238KB
MD5

112e40ee5541af5ba7b81ed771bae027
SHA1

beb32f617e9010c7dd55e5f7ee81ec68d6c96cda
SHA256

a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7
SHA512

cfd6bb1336e786c3574054c2ee2f28a87f268b8800719e6eeab859f9b3ca3c8e9963d39795c7068c7dd45164c56a2d93887853afe795a932617a838af45c6d9a
SSDEEP

6144:sXsD12Z8V0JtIb1RxS5CD/35e6mgLWUgkEmXlo7njMjqr:fLV0cb1Vj3U7UNNXlW

Score

8^/10

persistence upx

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4544	csrss.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4692-132-0x0000000000400000-0x000000000049F000-memory.dmp	upx
behavioral2/files/0x0006000000022e15-134.dat	upx
behavioral2/files/0x0006000000022e15-135.dat	upx
behavioral2/memory/4692-136-0x0000000000400000-0x000000000049F000-memory.dmp	upx
behavioral2/memory/4544-137-0x0000000000400000-0x000000000049F000-memory.dmp	upx
behavioral2/memory/4544-138-0x0000000000400000-0x000000000049F000-memory.dmp	upx

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	csrss.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\system = "C:\\Program Files (x86)\\newsoft\\csrss.exe"	csrss.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\newsoft\csrss.exe	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe
File opened for modification	C:\Program Files (x86)\newsoft\csrss.exe	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4692 wrote to memory of 4544	4692	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	81
PID 4692 wrote to memory of 4544	4692	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	81
PID 4692 wrote to memory of 4544	4692	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	81

C:\Users\Admin\AppData\Local\Temp\a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe
"C:\Users\Admin\AppData\Local\Temp\a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:4692
- C:\Program Files (x86)\newsoft\csrss.exe
  "C:\Program Files (x86)\newsoft\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  PID:4544

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

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:\Program Files (x86)\newsoft\csrss.exe

Filesize
238KB

MD5
112e40ee5541af5ba7b81ed771bae027

SHA1
beb32f617e9010c7dd55e5f7ee81ec68d6c96cda

SHA256
a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7

SHA512
cfd6bb1336e786c3574054c2ee2f28a87f268b8800719e6eeab859f9b3ca3c8e9963d39795c7068c7dd45164c56a2d93887853afe795a932617a838af45c6d9a

Download Submit
C:\Program Files (x86)\newsoft\csrss.exe

Filesize
238KB

MD5
112e40ee5541af5ba7b81ed771bae027

SHA1
beb32f617e9010c7dd55e5f7ee81ec68d6c96cda

SHA256
a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7

SHA512
cfd6bb1336e786c3574054c2ee2f28a87f268b8800719e6eeab859f9b3ca3c8e9963d39795c7068c7dd45164c56a2d93887853afe795a932617a838af45c6d9a

Download Submit
memory/4544-137-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download
memory/4544-138-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download
memory/4692-132-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download
memory/4692-136-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download