Analysis
- max time kernel
141s - max time network
117s - platform
windows10_x64 - resource
win10v20210408 - submitted
30/08/2021, 14:14
General
- Target triage_dropped_file.exe
- Size 1.1MB
- Sample210830-pb892vewt6
- SHA256 da1621ccdb3714c1fda08f6e783ff18962e4803fff14b3095d3e260c26642648
Malware Config
Extracted
-
agenttesla
-
Protocol
ftp
-
Host
ftp://ftp.tractorandinas.com/
-
Port
21
-
Username
-
Password
~P*xO7vPBc-o
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- AgentTesla Payload 2 IoCs
- Drops file in Drivers directory 1 IoCs
- 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.
- Adds Run key to start application 2 TTPs 1 IoCs
- 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 2 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 11 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\triage_dropped_file.exe"C:\Users\Admin\AppData\Local\Temp\triage_dropped_file.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\VNJCPdLEb" /XML "C:\Users\Admin\AppData\Local\Temp\tmp1965.tmp"2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Local\Temp\triage_dropped_file.exe"{path}"2⤵
- Drops file in Drivers directory
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/564-123-0x000000000AFF0000-0x000000000B08D000-memory.dmp
memory/564-117-0x0000000005CF0000-0x0000000005CF1000-memory.dmp
memory/564-119-0x00000000057F0000-0x0000000005CEE000-memory.dmp
memory/564-120-0x00000000057D0000-0x00000000057D1000-memory.dmp
memory/564-121-0x0000000005A50000-0x0000000005A51000-memory.dmp
memory/564-122-0x0000000005160000-0x000000000516E000-memory.dmp
memory/564-114-0x0000000000CC0000-0x0000000000CC1000-memory.dmp
memory/564-124-0x000000000B090000-0x000000000B0E4000-memory.dmp
memory/564-116-0x00000000056E0000-0x00000000056E1000-memory.dmp
memory/564-118-0x0000000005890000-0x0000000005891000-memory.dmp
memory/2800-127-0x0000000000400000-0x000000000043C000-memory.dmp
memory/2800-134-0x00000000057A0000-0x00000000057A1000-memory.dmp
memory/2800-135-0x0000000005D70000-0x0000000005D71000-memory.dmp
memory/2800-136-0x0000000006430000-0x0000000006431000-memory.dmp
memory/2800-139-0x00000000057A1000-0x00000000057A2000-memory.dmp