Analysis
-
max time kernel
150s -
max time network
145s -
platform
windows7_x64 -
resource
win7-en-20210920 -
submitted
14-10-2021 04:36
Static task
static1
Behavioral task
behavioral1
Sample
invo.scr
Resource
win7-en-20210920
General
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Target
invo.scr
-
Size
495KB
-
MD5
1c64859d2a5e195b51b5c1d0b973b2f3
-
SHA1
733895a6df13037644634316b616f2ab1818960f
-
SHA256
c0ef6cc74722f234a5d8176116dd0df60c32ce0a2ae7a7b88cf9dffd94f7f1a1
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SHA512
bc144fadf9f0b3a4ad6092693935b4ef2063a3f9fb429cc33d69b54db65872540065c323e64021b09107babaabb9057a9276cfbb897ddef2cedbd7ea3353762c
Malware Config
Extracted
nanocore
1.2.2.0
185.140.53.75:97
75237636-ccfc-402a-827d-5ad01371659e
-
activate_away_mode
true
- backup_connection_host
-
backup_dns_server
8.8.4.4
-
buffer_size
65535
-
build_time
2021-07-24T01:53:34.394429836Z
-
bypass_user_account_control
false
-
bypass_user_account_control_data
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
-
clear_access_control
true
-
clear_zone_identifier
false
-
connect_delay
4000
-
connection_port
97
-
default_group
Default
-
enable_debug_mode
true
-
gc_threshold
1.048576e+07
-
keep_alive_timeout
30000
-
keyboard_logging
false
-
lan_timeout
2500
-
max_packet_size
1.048576e+07
-
mutex
75237636-ccfc-402a-827d-5ad01371659e
-
mutex_timeout
5000
-
prevent_system_sleep
false
-
primary_connection_host
185.140.53.75
-
primary_dns_server
8.8.8.8
-
request_elevation
true
-
restart_delay
5000
-
run_delay
0
-
run_on_startup
false
-
set_critical_process
true
-
timeout_interval
5000
-
use_custom_dns_server
false
-
version
1.2.2.0
-
wan_timeout
8000
Signatures
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Adds Run key to start application 2 TTPs 1 IoCs
Processes:
RegSvcs.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\UDP Subsystem = "C:\\Program Files (x86)\\UDP Subsystem\\udpss.exe" RegSvcs.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
invo.scrdescription pid process target process PID 1756 set thread context of 1572 1756 invo.scr RegSvcs.exe -
Drops file in Program Files directory 2 IoCs
Processes:
RegSvcs.exedescription ioc process File created C:\Program Files (x86)\UDP Subsystem\udpss.exe RegSvcs.exe File opened for modification C:\Program Files (x86)\UDP Subsystem\udpss.exe RegSvcs.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
-
Creates scheduled task(s) 1 TTPs 3 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exeschtasks.exepid process 856 schtasks.exe 1608 schtasks.exe 1848 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
Processes:
invo.scrpowershell.exeRegSvcs.exepid process 1756 invo.scr 1756 invo.scr 468 powershell.exe 1572 RegSvcs.exe 1572 RegSvcs.exe 1572 RegSvcs.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
Processes:
RegSvcs.exepid process 1572 RegSvcs.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
Processes:
invo.scrpowershell.exeRegSvcs.exedescription pid process Token: SeDebugPrivilege 1756 invo.scr Token: SeDebugPrivilege 468 powershell.exe Token: SeDebugPrivilege 1572 RegSvcs.exe -
Suspicious use of WriteProcessMemory 28 IoCs
Processes:
invo.scrRegSvcs.exedescription pid process target process PID 1756 wrote to memory of 468 1756 invo.scr powershell.exe PID 1756 wrote to memory of 468 1756 invo.scr powershell.exe PID 1756 wrote to memory of 468 1756 invo.scr powershell.exe PID 1756 wrote to memory of 468 1756 invo.scr powershell.exe PID 1756 wrote to memory of 856 1756 invo.scr schtasks.exe PID 1756 wrote to memory of 856 1756 invo.scr schtasks.exe PID 1756 wrote to memory of 856 1756 invo.scr schtasks.exe PID 1756 wrote to memory of 856 1756 invo.scr schtasks.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1756 wrote to memory of 1572 1756 invo.scr RegSvcs.exe PID 1572 wrote to memory of 1608 1572 RegSvcs.exe schtasks.exe PID 1572 wrote to memory of 1608 1572 RegSvcs.exe schtasks.exe PID 1572 wrote to memory of 1608 1572 RegSvcs.exe schtasks.exe PID 1572 wrote to memory of 1608 1572 RegSvcs.exe schtasks.exe PID 1572 wrote to memory of 1848 1572 RegSvcs.exe schtasks.exe PID 1572 wrote to memory of 1848 1572 RegSvcs.exe schtasks.exe PID 1572 wrote to memory of 1848 1572 RegSvcs.exe schtasks.exe PID 1572 wrote to memory of 1848 1572 RegSvcs.exe schtasks.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\invo.scr"C:\Users\Admin\AppData\Local\Temp\invo.scr" /S1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\invo.scr"2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\sdEKmbTTxgFtdd" /XML "C:\Users\Admin\AppData\Local\Temp\tmp38BC.tmp"2⤵
- Creates scheduled task(s)
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C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"2⤵
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks.exe" /create /f /tn "UDP Subsystem" /xml "C:\Users\Admin\AppData\Local\Temp\tmp3A90.tmp"3⤵
- Creates scheduled task(s)
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C:\Windows\SysWOW64\schtasks.exe"schtasks.exe" /create /f /tn "UDP Subsystem Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmp3B9B.tmp"3⤵
- Creates scheduled task(s)
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Local\Temp\tmp3A90.tmpMD5
40b11ef601fb28f9b2e69d36857bf2ec
SHA1b6454020ad2ceed193f4792b77001d0bd741b370
SHA256c51e12d18cc664425f6711d8ae2507068884c7057092cfa11884100e1e9d49e1
SHA512e3c5bcc714cbfca4b8058ddcddf231dcefa69c15881ce3f8123e59ed45cfb5da052b56e1945dcf8dc7f800d62f9a4eecb82bca69a66a1530787aeffeb15e2bd5
-
C:\Users\Admin\AppData\Local\Temp\tmp3B9B.tmpMD5
c4aecdef99eba873119e79616df3f4b0
SHA1b1b3af52655fb633eed909dfed05b64fbbfac37c
SHA25624fd0d87bea36a024449a95f808aaa174e4ed9003cb8a427b67c02411b8a2e0b
SHA512e3f44b07267fccf4f5abd4efe80f2b037ddadc4cb898bdfca9d21ac5d79fcac828950065c2060d3ce125ee971fc3096183afee5287ba9951fbbda7257d8ed8d4
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memory/468-73-0x0000000002430000-0x000000000307A000-memory.dmpFilesize
12.3MB
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memory/468-74-0x0000000002430000-0x000000000307A000-memory.dmpFilesize
12.3MB
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memory/468-57-0x0000000000000000-mapping.dmp
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memory/468-72-0x0000000002430000-0x000000000307A000-memory.dmpFilesize
12.3MB
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memory/856-59-0x0000000000000000-mapping.dmp
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memory/1572-60-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-63-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-64-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-65-0x000000000041E792-mapping.dmp
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memory/1572-62-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-61-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-71-0x0000000000250000-0x0000000000251000-memory.dmpFilesize
4KB
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memory/1572-75-0x0000000000251000-0x0000000000252000-memory.dmpFilesize
4KB
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memory/1608-67-0x0000000000000000-mapping.dmp
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memory/1756-54-0x0000000076961000-0x0000000076963000-memory.dmpFilesize
8KB
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memory/1756-56-0x00000000020A1000-0x00000000020A2000-memory.dmpFilesize
4KB
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memory/1756-55-0x00000000020A0000-0x00000000020A1000-memory.dmpFilesize
4KB
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memory/1848-69-0x0000000000000000-mapping.dmp