agenttesla | cb2792644a81d965b332d8d165e1e6f75894b43942a33d7e367f9b3a36d4a2bf

General

Target
NYRNC200420511_FreightArrival.exe
Size 446KB
Sample201109-5b6bdmhpws
SHA256 cb2792644a81d965b332d8d165e1e6f75894b43942a33d7e367f9b3a36d4a2bf
MD5 4e94b9a3025122a9949b79b37eeb3cff
SHA1 a298bbb92765a40d6229da48b5c6c0edbc70f510
SHA512 8551ea40aa3ee4dfc119b4560bee1c6a501be24b53f209e6b1672902b37a063cdd859822ba5793383ef679364fadc672b03c5752915f5404c75be74bef6678f3
MD5 SHA1 SHA512

Score

10^/10

agenttesla coreentity evasion keylogger rezer0 spyware stealer trojan

Malware Config

Extracted

Credentials

Protocol
smtp
Host
mail.karmachalets.co.in
Port
587
Username
[email protected]
Password
Akshya@123

Extracted

Family

agenttesla

Credentials

Protocol
smtp
Host
mail.karmachalets.co.in
Port
587
Username
[email protected]
Password
Akshya@123

Signatures

AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
keylogger trojan stealer spyware agenttesla

CoreEntity .NET Packer 1 IoCs

A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

coreentity

resource	yara_rule
behavioral2/memory/3372-6-0x00000000059A0000-0x00000000059A2000-memory.dmp	coreentity

AgentTesla Payload 2 IoCs

resource	yara_rule
behavioral2/memory/700-12-0x0000000000400000-0x0000000000452000-memory.dmp	family_agenttesla
behavioral2/memory/700-13-0x000000000044C8DE-mapping.dmp	family_agenttesla

Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

rezer0 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

resource	yara_rule
behavioral2/memory/3372-7-0x0000000008E70000-0x0000000008EC3000-memory.dmp	rezer0

Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	NYRNC200420511_FreightArrival.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	NYRNC200420511_FreightArrival.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	NYRNC200420511_FreightArrival.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	NYRNC200420511_FreightArrival.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3372 set thread context of 700	3372	NYRNC200420511_FreightArrival.exe	78

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
192	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3372	NYRNC200420511_FreightArrival.exe
3372	NYRNC200420511_FreightArrival.exe
3372	NYRNC200420511_FreightArrival.exe
700	NYRNC200420511_FreightArrival.exe
700	NYRNC200420511_FreightArrival.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3372	NYRNC200420511_FreightArrival.exe
Token: SeDebugPrivilege	700	NYRNC200420511_FreightArrival.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3372 wrote to memory of 192	3372	NYRNC200420511_FreightArrival.exe	75
PID 3372 wrote to memory of 192	3372	NYRNC200420511_FreightArrival.exe	75
PID 3372 wrote to memory of 192	3372	NYRNC200420511_FreightArrival.exe	75
PID 3372 wrote to memory of 760	3372	NYRNC200420511_FreightArrival.exe	77
PID 3372 wrote to memory of 760	3372	NYRNC200420511_FreightArrival.exe	77
PID 3372 wrote to memory of 760	3372	NYRNC200420511_FreightArrival.exe	77
PID 3372 wrote to memory of 700	3372	NYRNC200420511_FreightArrival.exe	78
PID 3372 wrote to memory of 700	3372	NYRNC200420511_FreightArrival.exe	78
PID 3372 wrote to memory of 700	3372	NYRNC200420511_FreightArrival.exe	78
PID 3372 wrote to memory of 700	3372	NYRNC200420511_FreightArrival.exe	78
PID 3372 wrote to memory of 700	3372	NYRNC200420511_FreightArrival.exe	78
PID 3372 wrote to memory of 700	3372	NYRNC200420511_FreightArrival.exe	78
PID 3372 wrote to memory of 700	3372	NYRNC200420511_FreightArrival.exe	78
PID 3372 wrote to memory of 700	3372	NYRNC200420511_FreightArrival.exe	78
PID 700 wrote to memory of 1872	700	NYRNC200420511_FreightArrival.exe	82
PID 700 wrote to memory of 1872	700	NYRNC200420511_FreightArrival.exe	82
PID 700 wrote to memory of 1872	700	NYRNC200420511_FreightArrival.exe	82

C:\Users\Admin\AppData\Local\Temp\NYRNC200420511_FreightArrival.exe
"C:\Users\Admin\AppData\Local\Temp\NYRNC200420511_FreightArrival.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
PID:3372
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\PldCGfbSGLnQ" /XML "C:\Users\Admin\AppData\Local\Temp\tmp577C.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:192
- C:\Users\Admin\AppData\Local\Temp\NYRNC200420511_FreightArrival.exe
  "{path}"
  2⤵
  PID:760
- C:\Users\Admin\AppData\Local\Temp\NYRNC200420511_FreightArrival.exe
  "{path}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:700
- - C:\Windows\SysWOW64\netsh.exe
    "netsh" wlan show profile
    3⤵
    PID:1872