8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372

General

Target

8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
Size

38KB
MD5

80669037be14749384c364424db64fd0
SHA1

df7d67cff05d6b905660c70907187f87cad411d5
SHA256

8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372
SHA512

681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394
SSDEEP

768:uFDKZIRxEAo/Lifrz/YaqeUNNqifW5ROj10Au4pc24yjhxl:uxqmfv/Y/tqifW/Oj10Wc2RVr

Score

8^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
1220	crss.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1988	netsh.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\f5101deccaff383a92d229a66cb9c194.exe	crss.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\f5101deccaff383a92d229a66cb9c194.exe	crss.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\f5101deccaff383a92d229a66cb9c194 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\crss.exe\" .."	crss.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\f5101deccaff383a92d229a66cb9c194 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\crss.exe\" .."	crss.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\Framework64\v2.0.50727\config\security.config.cch.new	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
File created	C:\Windows\Microsoft.NET\Framework64\v2.0.50727\config\enterprisesec.config.cch.new	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.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 AdjustPrivilegeToken 17 IoCs

description	pid	Process
Token: SeDebugPrivilege	1220	crss.exe
Token: 33	1220	crss.exe
Token: SeIncBasePriorityPrivilege	1220	crss.exe
Token: 33	1220	crss.exe
Token: SeIncBasePriorityPrivilege	1220	crss.exe
Token: 33	1220	crss.exe
Token: SeIncBasePriorityPrivilege	1220	crss.exe
Token: 33	1220	crss.exe
Token: SeIncBasePriorityPrivilege	1220	crss.exe
Token: 33	1220	crss.exe
Token: SeIncBasePriorityPrivilege	1220	crss.exe
Token: 33	1220	crss.exe
Token: SeIncBasePriorityPrivilege	1220	crss.exe
Token: 33	1220	crss.exe
Token: SeIncBasePriorityPrivilege	1220	crss.exe
Token: 33	1220	crss.exe
Token: SeIncBasePriorityPrivilege	1220	crss.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1028 wrote to memory of 1220	1028	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe	27
PID 1028 wrote to memory of 1220	1028	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe	27
PID 1028 wrote to memory of 1220	1028	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe	27
PID 1220 wrote to memory of 1988	1220	crss.exe	28
PID 1220 wrote to memory of 1988	1220	crss.exe	28
PID 1220 wrote to memory of 1988	1220	crss.exe	28

C:\Users\Admin\AppData\Local\Temp\8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
"C:\Users\Admin\AppData\Local\Temp\8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe"
1⤵
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:1028
- C:\Users\Admin\AppData\Local\Temp\crss.exe
  "C:\Users\Admin\AppData\Local\Temp\crss.exe"
  2⤵
  - Executes dropped EXE
  - Drops startup file
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1220
- - C:\Windows\system32\netsh.exe
    netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\crss.exe" "crss.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    PID:1988

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

1

T1031

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:\Users\Admin\AppData\Local\Temp\crss.exe

Filesize
38KB

MD5
80669037be14749384c364424db64fd0

SHA1
df7d67cff05d6b905660c70907187f87cad411d5

SHA256
8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372

SHA512
681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394

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

Filesize
38KB

MD5
80669037be14749384c364424db64fd0

SHA1
df7d67cff05d6b905660c70907187f87cad411d5

SHA256
8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372

SHA512
681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394

Download Submit
memory/1028-57-0x000007FEFBDE1000-0x000007FEFBDE3000-memory.dmp

Filesize
8KB

Download
memory/1028-54-0x000007FEF4150000-0x000007FEF4B73000-memory.dmp

Filesize
10.1MB

Download
memory/1028-56-0x000007FEF29B0000-0x000007FEF3A46000-memory.dmp

Filesize
16.6MB

Download
memory/1028-55-0x000007FEF3C90000-0x000007FEF4150000-memory.dmp

Filesize
4.8MB

Download
memory/1220-61-0x000007FEF4150000-0x000007FEF4B73000-memory.dmp

Filesize
10.1MB

Download
memory/1220-62-0x000007FEF3C90000-0x000007FEF4150000-memory.dmp

Filesize
4.8MB

Download
memory/1220-63-0x000007FEF29B0000-0x000007FEF3A46000-memory.dmp

Filesize
16.6MB

Download
memory/1220-65-0x0000000000136000-0x0000000000155000-memory.dmp

Filesize
124KB

Download
memory/1220-67-0x0000000000136000-0x0000000000155000-memory.dmp

Filesize
124KB

Download

Analysis

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