Analysis
- max time kernel
85s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20220414-en - submitted
21/05/2022, 02:27
General
- Target Scan_copy_08272020.exe
- Size 671KB
- Sample220521-cxgc8aefc2
- SHA256 1b70d8bec1085949c128725ae5a8b69ccaeda7c20fb1e7be0d6e9ff2b5ef1a85
Malware Config
Extracted
-
Protocol
smtp
-
Host
smtp.yandex.com
-
Port
587
-
Username
-
Password
khalik000
Extracted
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agenttesla
-
Protocol
smtp
-
Host
smtp.yandex.com
-
Port
587
-
Username
-
Password
khalik000
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- AgentTesla Payload 1 IoCs
- Looks for VirtualBox Guest Additions in registry 2 TTPs
- Looks for VMWare Tools registry key 2 TTPs
- Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
- Maps connected drives based on registry 3 TTPs 2 IoCs
Disk information is often read in order to detect sandboxing environments.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 7 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\Scan_copy_08272020.exe"C:\Users\Admin\AppData\Local\Temp\Scan_copy_08272020.exe"1⤵
- Checks BIOS information in registry
- Checks computer location settings
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\HhhGajJWoFvaTg" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8C52.tmp"2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\Scan_copy_08272020.exe"{path}"2⤵
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C:\Users\Admin\AppData\Local\Temp\Scan_copy_08272020.exe"{path}"2⤵
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
tmp8C52.tmp
memory/212-138-0x0000000000400000-0x0000000000466000-memory.dmp
memory/212-139-0x0000000005F70000-0x0000000006514000-memory.dmp
memory/212-140-0x0000000006E40000-0x0000000006E90000-memory.dmp
memory/212-141-0x0000000007170000-0x000000000717A000-memory.dmp
memory/1240-130-0x00000000001E0000-0x000000000028E000-memory.dmp
memory/1240-131-0x00000000052D0000-0x0000000005362000-memory.dmp
memory/1240-132-0x000000000B5E0000-0x000000000B67C000-memory.dmp
memory/1240-133-0x000000000B680000-0x000000000B6E6000-memory.dmp