Analysis
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max time kernel
147s -
max time network
187s -
platform
windows7_x64 -
resource
win7-20220414-en -
submitted
21-05-2022 01:56
Behavioral task
behavioral1
Sample
invoices-docs-view.exe
Resource
win7-20220414-en
General
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Target
invoices-docs-view.exe
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Size
439KB
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MD5
a635c9a6dfa79affe8bf27cb4eae89d4
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SHA1
b0d2e8f668085ef770757c5498ba84f506285381
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SHA256
ef5b4a828d4322e2ca5681423488e03e9991191809fc068d80ce0bbeba792984
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SHA512
81e0b8d0dab93e4f566bbdaeab2a10396a95c6826a45fc02f41cf19fbbb6a41a2d592762d58b37ad4dc23ee08ead77e9e60372f2d630057b5f94cb3997ae1d3a
Malware Config
Extracted
nanocore
1.2.2.0
79.134.225.89:12190
4e4951f6-c9ee-4a8b-863c-f53c12df989f
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activate_away_mode
true
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backup_connection_host
79.134.225.89
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backup_dns_server
8.8.4.4
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buffer_size
65535
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build_time
2020-02-17T01:50:29.200734436Z
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bypass_user_account_control
true
- bypass_user_account_control_data
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clear_access_control
true
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clear_zone_identifier
false
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connect_delay
4000
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connection_port
12190
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default_group
cpa
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enable_debug_mode
true
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gc_threshold
1.048576e+07
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keep_alive_timeout
30000
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keyboard_logging
false
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lan_timeout
2500
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max_packet_size
1.048576e+07
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mutex
4e4951f6-c9ee-4a8b-863c-f53c12df989f
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mutex_timeout
5000
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prevent_system_sleep
false
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primary_connection_host
79.134.225.89
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primary_dns_server
8.8.8.8
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request_elevation
true
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restart_delay
5000
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run_delay
0
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run_on_startup
false
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set_critical_process
true
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timeout_interval
5000
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use_custom_dns_server
false
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version
1.2.2.0
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wan_timeout
8000
Signatures
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CoreEntity .NET Packer 1 IoCs
A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.
Processes:
resource yara_rule behavioral1/memory/1908-57-0x00000000004C0000-0x00000000004C8000-memory.dmp coreentity -
SnakeBOT
SnakeBOT is a heavily obfuscated .NET downloader.
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Contains SnakeBOT related strings 1 IoCs
Processes:
resource yara_rule behavioral1/memory/1908-54-0x0000000000FE0000-0x0000000001056000-memory.dmp snakebot_strings -
ReZer0 packer 1 IoCs
Detects ReZer0, a packer with multiple versions used in various campaigns.
Processes:
resource yara_rule behavioral1/memory/1908-58-0x0000000000F90000-0x0000000000FD0000-memory.dmp rezer0 -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
invoices-docs-view.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\WPA Subsystem = "C:\\Program Files (x86)\\WPA Subsystem\\wpass.exe" invoices-docs-view.exe -
Processes:
invoices-docs-view.exedescription ioc process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA invoices-docs-view.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
invoices-docs-view.exedescription pid process target process PID 1908 set thread context of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe -
Drops file in Program Files directory 2 IoCs
Processes:
invoices-docs-view.exedescription ioc process File created C:\Program Files (x86)\WPA Subsystem\wpass.exe invoices-docs-view.exe File opened for modification C:\Program Files (x86)\WPA Subsystem\wpass.exe invoices-docs-view.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 6 IoCs
Processes:
invoices-docs-view.exeinvoices-docs-view.exepid process 1908 invoices-docs-view.exe 1908 invoices-docs-view.exe 1908 invoices-docs-view.exe 1572 invoices-docs-view.exe 1572 invoices-docs-view.exe 1572 invoices-docs-view.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
Processes:
invoices-docs-view.exepid process 1572 invoices-docs-view.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
invoices-docs-view.exeinvoices-docs-view.exedescription pid process Token: SeDebugPrivilege 1908 invoices-docs-view.exe Token: SeDebugPrivilege 1572 invoices-docs-view.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
Processes:
invoices-docs-view.exepid process 1908 invoices-docs-view.exe 1908 invoices-docs-view.exe -
Suspicious use of WriteProcessMemory 17 IoCs
Processes:
invoices-docs-view.exedescription pid process target process PID 1908 wrote to memory of 1788 1908 invoices-docs-view.exe schtasks.exe PID 1908 wrote to memory of 1788 1908 invoices-docs-view.exe schtasks.exe PID 1908 wrote to memory of 1788 1908 invoices-docs-view.exe schtasks.exe PID 1908 wrote to memory of 1788 1908 invoices-docs-view.exe schtasks.exe PID 1908 wrote to memory of 652 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 652 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 652 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 652 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe PID 1908 wrote to memory of 1572 1908 invoices-docs-view.exe invoices-docs-view.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\invoices-docs-view.exe"C:\Users\Admin\AppData\Local\Temp\invoices-docs-view.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\IHVeunQQvXE" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF77A.tmp"2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\invoices-docs-view.exe"{path}"2⤵
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C:\Users\Admin\AppData\Local\Temp\invoices-docs-view.exe"{path}"2⤵
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
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\tmpF77A.tmpFilesize
1KB
MD51f73f43f22abea3ca0b123d4ea7da71c
SHA1afaf0c5f350ac27f79453799dbebcf9b0204a058
SHA256eaa5dc4b5f3931b3f5c47336843272bb498945caed176363adfbf84823577bb6
SHA5128973c2bdb84d4e4800a3d0d0ce0136889d308502964ad7867f1b2d38f33da025cffc4e1c8ecfe3bcb57ae412a5d0e944926c930feeb14ce90e2ff8f45668e2a0
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memory/1572-68-0x000000000041E792-mapping.dmp
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memory/1572-70-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-64-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-76-0x0000000000670000-0x000000000067A000-memory.dmpFilesize
40KB
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memory/1572-65-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-75-0x00000000006A0000-0x00000000006BE000-memory.dmpFilesize
120KB
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memory/1572-61-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-67-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-74-0x0000000000660000-0x000000000066A000-memory.dmpFilesize
40KB
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memory/1572-72-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1572-62-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1788-59-0x0000000000000000-mapping.dmp
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memory/1908-54-0x0000000000FE0000-0x0000000001056000-memory.dmpFilesize
472KB
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memory/1908-56-0x0000000075FC1000-0x0000000075FC3000-memory.dmpFilesize
8KB
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memory/1908-57-0x00000000004C0000-0x00000000004C8000-memory.dmpFilesize
32KB
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memory/1908-55-0x0000000000BB0000-0x0000000000BF6000-memory.dmpFilesize
280KB
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memory/1908-58-0x0000000000F90000-0x0000000000FD0000-memory.dmpFilesize
256KB