Analysis
- max time kernel
131s - max time network
111s - platform
windows10_x64 - resource
win10v20210408 - submitted
29/09/2021, 05:52
General
- Target New Order.pdf.exe
- Size 876KB
- Sample210929-gkq44sdhak
- SHA256 f7e23df2027195ee0a30647e149bd79cd77eccb8a1d82cd38cc74b364ba94a05
Malware Config
Extracted
-
agenttesla
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Protocol
smtp
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Host
smtp.northbey-medical.com
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Port
587
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Username
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Password
XRG$jgA7
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- Contains code to disable Windows Defender 1 IoCs
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
- AgentTesla Payload 3 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.
- 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.
- 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 5 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\New Order.pdf.exe"C:\Users\Admin\AppData\Local\Temp\New Order.pdf.exe"1⤵
- Checks BIOS information in registry
- 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\pczWNJsDT" /XML "C:\Users\Admin\AppData\Local\Temp\tmpBDEC.tmp"2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\New Order.pdf.exe"{path}"2⤵
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C:\Users\Admin\AppData\Local\Temp\New Order.pdf.exe"{path}"2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/656-119-0x0000000005910000-0x0000000005911000-memory.dmp
memory/656-124-0x000000000A420000-0x000000000A458000-memory.dmp
memory/656-114-0x0000000000EF0000-0x0000000000EF1000-memory.dmp
memory/656-120-0x0000000005B20000-0x0000000005B21000-memory.dmp
memory/656-121-0x00000000059E0000-0x0000000005EDE000-memory.dmp
memory/656-122-0x0000000003240000-0x000000000324E000-memory.dmp
memory/656-123-0x00000000093A0000-0x0000000009419000-memory.dmp
memory/656-118-0x0000000005A80000-0x0000000005A81000-memory.dmp
memory/656-125-0x000000000D5D0000-0x000000000D5D1000-memory.dmp
memory/656-116-0x0000000005940000-0x0000000005941000-memory.dmp
memory/656-117-0x0000000005EE0000-0x0000000005EE1000-memory.dmp
memory/1172-128-0x0000000000400000-0x000000000043C000-memory.dmp
memory/1172-135-0x0000000005180000-0x000000000567E000-memory.dmp
memory/1172-136-0x0000000005210000-0x0000000005211000-memory.dmp