Resubmissions
18-01-2021 13:44
210118-tnaye7c7rn 1017-01-2021 17:18
210117-bjwdekjbns 1003-01-2021 10:03
210103-jfxpahl1la 10Analysis
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max time kernel
150s -
max time network
152s -
platform
windows10_x64 -
resource
win10v20201028 -
submitted
18-01-2021 13:44
Static task
static1
Behavioral task
behavioral1
Sample
7P7DYQVc.exe
Resource
win7v20201028
Behavioral task
behavioral2
Sample
7P7DYQVc.exe
Resource
win10v20201028
General
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Target
7P7DYQVc.exe
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Size
23KB
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MD5
d350b0d6462773a8f98d60ec7ca993fe
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SHA1
a8eced99a403074fd6be13a579df9a35acb7acf9
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SHA256
0e798055549a18d74a4c26621e5925883c55a33f2be16cb4b79eeefd40c9dd0c
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SHA512
4105c6a027a7e9b89f08cc635ea6cefab8f3c270b9ddb7915ef0232084cad96a1df3b328f97be653f7d5ccaa457396450d2189269ddf9379b24c5b182ca9e567
Malware Config
Extracted
njrat
Blue
AntiBot
anti.kro.kr:7
bd8a83ed8b02d3c995a02f159f9c2953
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reg_key
bd8a83ed8b02d3c995a02f159f9c2953
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splitter
|'|'|
Signatures
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Executes dropped EXE 1 IoCs
Processes:
csrss.exepid process 212 csrss.exe -
Modifies Windows Firewall 1 TTPs
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Drops startup file 2 IoCs
Processes:
csrss.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bd8a83ed8b02d3c995a02f159f9c2953.exe csrss.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bd8a83ed8b02d3c995a02f159f9c2953.exe csrss.exe -
Adds Run key to start application 2 TTPs 2 IoCs
Processes:
csrss.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\bd8a83ed8b02d3c995a02f159f9c2953 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .." csrss.exe Set value (str) \REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\bd8a83ed8b02d3c995a02f159f9c2953 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .." csrss.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious use of AdjustPrivilegeToken 33 IoCs
Processes:
csrss.exedescription pid process Token: SeDebugPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe Token: 33 212 csrss.exe Token: SeIncBasePriorityPrivilege 212 csrss.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
7P7DYQVc.execsrss.exedescription pid process target process PID 412 wrote to memory of 212 412 7P7DYQVc.exe csrss.exe PID 412 wrote to memory of 212 412 7P7DYQVc.exe csrss.exe PID 412 wrote to memory of 212 412 7P7DYQVc.exe csrss.exe PID 212 wrote to memory of 1384 212 csrss.exe netsh.exe PID 212 wrote to memory of 1384 212 csrss.exe netsh.exe PID 212 wrote to memory of 1384 212 csrss.exe netsh.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\7P7DYQVc.exe"C:\Users\Admin\AppData\Local\Temp\7P7DYQVc.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\csrss.exe"C:\Users\Admin\AppData\Local\Temp\csrss.exe"2⤵
- Executes dropped EXE
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\netsh.exenetsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\csrss.exe" "csrss.exe" ENABLE3⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\csrss.exeMD5
d350b0d6462773a8f98d60ec7ca993fe
SHA1a8eced99a403074fd6be13a579df9a35acb7acf9
SHA2560e798055549a18d74a4c26621e5925883c55a33f2be16cb4b79eeefd40c9dd0c
SHA5124105c6a027a7e9b89f08cc635ea6cefab8f3c270b9ddb7915ef0232084cad96a1df3b328f97be653f7d5ccaa457396450d2189269ddf9379b24c5b182ca9e567
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C:\Users\Admin\AppData\Local\Temp\csrss.exeMD5
d350b0d6462773a8f98d60ec7ca993fe
SHA1a8eced99a403074fd6be13a579df9a35acb7acf9
SHA2560e798055549a18d74a4c26621e5925883c55a33f2be16cb4b79eeefd40c9dd0c
SHA5124105c6a027a7e9b89f08cc635ea6cefab8f3c270b9ddb7915ef0232084cad96a1df3b328f97be653f7d5ccaa457396450d2189269ddf9379b24c5b182ca9e567
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memory/212-3-0x0000000000000000-mapping.dmp
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memory/212-6-0x0000000003301000-0x0000000003302000-memory.dmpFilesize
4KB
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memory/412-2-0x0000000003300000-0x0000000003301000-memory.dmpFilesize
4KB
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memory/1384-7-0x0000000000000000-mapping.dmp