fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676

General

Target

fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
Size

144KB
MD5

431e2972d1b24ce97e8a42a2481396af
SHA1

534dd3c9e03afbafb2198abb678774e682bf2647
SHA256

fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676
SHA512

b12088338806ee39b59cdc5e3d9f755e25ff904d387d3afa2894ca45a0b7037129e6ab3fc533743b7db1b37ee0ba66564fe4a3669beeda6847564c47260f718c
SSDEEP

1536:BLfFwyq9bH0xl+sVFd6Gg9leQX0dci0y/VeIo9HkSQOVz4ZkN/pUY:RfzqpHCLde0dVR/lo9EIVEZkNRUY

Score

10^/10

evasion persistence upx

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.execsrss.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe \"C:\\Users\\Admin\\AppData\\Roaming\\csrss.exe\""	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe \"C:\\Users\\Admin\\AppData\\Roaming\\csrss.exe\""	csrss.exe

Executes dropped EXE 1 IoCs

Processes:

csrss.exe

pid process

3276 csrss.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4988 netsh.exe

pid	process
3276	csrss.exe

pid	process
4988	netsh.exe

UPX packed file 7 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1392-132-0x0000000000400000-0x0000000000425000-memory.dmp	upx
behavioral2/memory/1392-135-0x0000000000400000-0x0000000000425000-memory.dmp	upx
C:\Users\Admin\AppData\Roaming\csrss.exe	upx
C:\Users\Admin\AppData\Roaming\csrss.exe	upx
behavioral2/memory/1392-142-0x0000000000400000-0x0000000000425000-memory.dmp	upx
behavioral2/memory/3276-143-0x0000000000400000-0x0000000000425000-memory.dmp	upx
behavioral2/memory/3276-144-0x0000000000400000-0x0000000000425000-memory.dmp	upx

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.execsrss.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\MSWUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\csrss.exe\""	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run	csrss.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MSWUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\csrss.exe\""	csrss.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	csrss.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\MSWUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\csrss.exe\""	csrss.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MSWUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\csrss.exe\""	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.execsrss.exe

pid process

1392 fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
3276 csrss.exe

pid	process
1392	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
3276	csrss.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe

description	pid	process	target process
PID 1392 wrote to memory of 4988	1392	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe	netsh.exe
PID 1392 wrote to memory of 4988	1392	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe	netsh.exe
PID 1392 wrote to memory of 4988	1392	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe	netsh.exe
PID 1392 wrote to memory of 3276	1392	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe	csrss.exe
PID 1392 wrote to memory of 3276	1392	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe	csrss.exe
PID 1392 wrote to memory of 3276	1392	fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe	csrss.exe

C:\Users\Admin\AppData\Local\Temp\fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
"C:\Users\Admin\AppData\Local\Temp\fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1392

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Roaming\csrss.exe" CityScape Enable
2⤵
- Modifies Windows Firewall
PID:4988

C:\Users\Admin\AppData\Roaming\csrss.exe
/d C:\Users\Admin\AppData\Local\Temp\fb0530e5aaeb8d4594cd64bbc5ff52afdfca8dfc8722da25e17bd9087c77d676.exe
2⤵
- Modifies WinLogon for persistence
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
PID:3276

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

Winlogon Helper DLL

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\csrss.exe

Filesize
144KB

MD5
41f2b495214576a81703deb12ef348cf

SHA1
8f38d1049635ab75152eca59ec6ba79a8b1e07df

SHA256
9f73ae8faab8ec1b2929a0959afca7ef01d56d9af234507f1d47a77d8f606c60

SHA512
d257c48f19ca0cf4235964f25763c84eabd48ac7d710c3b3a983d571974797300985b87f0b4ef3b17f52c21c415c7a7f2ca1711581dcef8514a093b17992faa0

Download Submit
C:\Users\Admin\AppData\Roaming\csrss.exe

Filesize
144KB

MD5
41f2b495214576a81703deb12ef348cf

SHA1
8f38d1049635ab75152eca59ec6ba79a8b1e07df

SHA256
9f73ae8faab8ec1b2929a0959afca7ef01d56d9af234507f1d47a77d8f606c60

SHA512
d257c48f19ca0cf4235964f25763c84eabd48ac7d710c3b3a983d571974797300985b87f0b4ef3b17f52c21c415c7a7f2ca1711581dcef8514a093b17992faa0

Download Submit
memory/1392-132-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1392-135-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1392-142-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3276-137-0x0000000000000000-mapping.dmp

Download
memory/3276-143-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3276-144-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/4988-136-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads