a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7

General

Target

a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe
Size

238KB
MD5

112e40ee5541af5ba7b81ed771bae027
SHA1

beb32f617e9010c7dd55e5f7ee81ec68d6c96cda
SHA256

a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7
SHA512

cfd6bb1336e786c3574054c2ee2f28a87f268b8800719e6eeab859f9b3ca3c8e9963d39795c7068c7dd45164c56a2d93887853afe795a932617a838af45c6d9a
SSDEEP

6144:sXsD12Z8V0JtIb1RxS5CD/35e6mgLWUgkEmXlo7njMjqr:fLV0cb1Vj3U7UNNXlW

Score

8^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
1680	csrss.exe

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000b0000000122f9-55.dat	upx
behavioral1/files/0x000b0000000122f9-57.dat	upx
behavioral1/files/0x000b0000000122f9-60.dat	upx
behavioral1/files/0x000b0000000122f9-59.dat	upx
behavioral1/files/0x000b0000000122f9-62.dat	upx
behavioral1/files/0x000b0000000122f9-61.dat	upx
behavioral1/memory/2024-63-0x0000000000400000-0x000000000049F000-memory.dmp	upx
behavioral1/memory/1680-64-0x0000000000400000-0x000000000049F000-memory.dmp	upx
behavioral1/memory/1680-66-0x0000000000400000-0x000000000049F000-memory.dmp	upx

Loads dropped DLL 4 IoCs

pid	Process
2024	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe
1680	csrss.exe
1680	csrss.exe
1680	csrss.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-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	csrss.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\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 7 IoCs

description	pid	Process	procid_target
PID 2024 wrote to memory of 1680	2024	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	27
PID 2024 wrote to memory of 1680	2024	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	27
PID 2024 wrote to memory of 1680	2024	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	27
PID 2024 wrote to memory of 1680	2024	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	27
PID 2024 wrote to memory of 1680	2024	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	27
PID 2024 wrote to memory of 1680	2024	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	27
PID 2024 wrote to memory of 1680	2024	a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe	27

C:\Users\Admin\AppData\Local\Temp\a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe
"C:\Users\Admin\AppData\Local\Temp\a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7.exe"
1⤵
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:2024
- C:\Program Files (x86)\newsoft\csrss.exe
  "C:\Program Files (x86)\newsoft\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Adds Run key to start application
  PID:1680

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

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

Filesize
238KB

MD5
112e40ee5541af5ba7b81ed771bae027

SHA1
beb32f617e9010c7dd55e5f7ee81ec68d6c96cda

SHA256
a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7

SHA512
cfd6bb1336e786c3574054c2ee2f28a87f268b8800719e6eeab859f9b3ca3c8e9963d39795c7068c7dd45164c56a2d93887853afe795a932617a838af45c6d9a

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

Filesize
238KB

MD5
112e40ee5541af5ba7b81ed771bae027

SHA1
beb32f617e9010c7dd55e5f7ee81ec68d6c96cda

SHA256
a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7

SHA512
cfd6bb1336e786c3574054c2ee2f28a87f268b8800719e6eeab859f9b3ca3c8e9963d39795c7068c7dd45164c56a2d93887853afe795a932617a838af45c6d9a

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

Filesize
238KB

MD5
112e40ee5541af5ba7b81ed771bae027

SHA1
beb32f617e9010c7dd55e5f7ee81ec68d6c96cda

SHA256
a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7

SHA512
cfd6bb1336e786c3574054c2ee2f28a87f268b8800719e6eeab859f9b3ca3c8e9963d39795c7068c7dd45164c56a2d93887853afe795a932617a838af45c6d9a

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

Filesize
238KB

MD5
112e40ee5541af5ba7b81ed771bae027

SHA1
beb32f617e9010c7dd55e5f7ee81ec68d6c96cda

SHA256
a323e68aebc97eb27e51be1676503e14680f4220b86f91bcee50b0bcc92fc4b7

SHA512
cfd6bb1336e786c3574054c2ee2f28a87f268b8800719e6eeab859f9b3ca3c8e9963d39795c7068c7dd45164c56a2d93887853afe795a932617a838af45c6d9a

Download Submit
memory/1680-64-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download
memory/1680-65-0x0000000000240000-0x00000000002DF000-memory.dmp

Filesize
636KB

Download
memory/1680-66-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download
memory/2024-54-0x00000000766D1000-0x00000000766D3000-memory.dmp

Filesize
8KB

Download
memory/2024-63-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download

Analysis

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