Analysis
- max time kernel
71s - max time network
124s - platform
windows10_x64 - resource
win10v20201028 - submitted
09/11/2020, 19:59
General
- Target 20202105.exe
- Size 709KB
- Sample201109-7796jjjsde
- SHA256 ddef618a8a5edbda2aad2dba2eac7de1d0f7a4e31cc4bebb9f2b6b4dd43d0174
Malware Config
Extracted
-
Protocol
smtp
-
Host
mail.mail15.cp247.net
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Port
587
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Username
-
Password
Mm8182
Extracted
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agenttesla
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Protocol
smtp
-
Host
mail.mail15.cp247.net
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Port
587
-
Username
-
Password
Mm8182
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- CoreEntity .NET Packer 1 IoCs
A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.
- AgentTesla Payload 2 IoCs
- rezer0 1 IoCs
Detects ReZer0, a packer with multiple versions used in various campaigns.
- Disables RegEdit via registry modification
- Disables Task Manager via registry modification
- 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.
- 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.
- Modifies registry key 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\20202105.exe"C:\Users\Admin\AppData\Local\Temp\20202105.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\NoLiUOXKlEHb" /XML "C:\Users\Admin\AppData\Local\Temp\tmp73AF.tmp"2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\20202105.exe"{path}"2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\REG.exeREG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f3⤵
- Modifies registry key
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
memory/3372-14-0x0000000073920000-0x000000007400E000-memory.dmp
memory/3372-11-0x0000000000400000-0x0000000000450000-memory.dmp
memory/3372-19-0x00000000054C0000-0x00000000054C1000-memory.dmp
memory/3372-20-0x0000000005FE0000-0x0000000005FE1000-memory.dmp
memory/3564-6-0x00000000070C0000-0x00000000070C1000-memory.dmp
memory/3564-7-0x0000000004F90000-0x0000000004F92000-memory.dmp
memory/3564-8-0x0000000006860000-0x00000000068B2000-memory.dmp
memory/3564-0-0x0000000073920000-0x000000007400E000-memory.dmp
memory/3564-4-0x0000000004D60000-0x0000000004D61000-memory.dmp
memory/3564-3-0x00000000051C0000-0x00000000051C1000-memory.dmp
memory/3564-5-0x0000000004D40000-0x0000000004D41000-memory.dmp
memory/3564-1-0x0000000000430000-0x0000000000431000-memory.dmp