agenttesla | 8ae671d5515672bc6adbb32d2ab738ddb93d00553679c01ac69575f451cf97f2

General

Target
INVITATION TO BID FOR TENDER.exe
Size 951KB
Sample200909-nnlcbya13e
SHA256 8ae671d5515672bc6adbb32d2ab738ddb93d00553679c01ac69575f451cf97f2
MD5 c8ff8e828c3816031dad3e5393937810
SHA1 9bc9501c56857394b561f6594e032b4b5597a192
SHA512 f9eb2140460830c49415b8496c0e3ce2d23c8307f729208ff407c358009c18af9ffd3b06a0cbbb3f4b664205e844fbf0296978159e0e6ce3548767194e66a0c2
MD5 SHA1 SHA512

Score

10^/10

keylogger stealer evasion spyware persistence trojan agenttesla

Malware Config

Extracted

Credentials

Protocol
smtp
Host
mail.subzerosolution.com
Port
587
Username
[email protected]
Password
subzero123porc

Signatures

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

AgentTesla Payload 3 IoCs

keylogger stealer

resource	yara_rule
behavioral2/memory/1240-2-0x0000000000400000-0x0000000000466000-memory.dmp	agent_tesla
behavioral2/memory/1240-2-0x0000000000400000-0x0000000000466000-memory.dmp	agent_tesla
behavioral2/memory/1240-3-0x0000000000460D4E-mapping.dmp	agent_tesla

Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
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\SystemBiosVersion	INVITATION TO BID FOR TENDER.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	INVITATION TO BID FOR TENDER.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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1400429095-533421673-2598934218-1000\Software\Microsoft\Windows\CurrentVersion\Run\zvVbs = "C:\\Users\\Admin\\AppData\\Roaming\\zvVbs\\zvVbs.exe"	INVITATION TO BID FOR TENDER.exe

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 value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	INVITATION TO BID FOR TENDER.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	INVITATION TO BID FOR TENDER.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 728 set thread context of 1240	728	INVITATION TO BID FOR TENDER.exe	79

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\ServiceProfiles\LocalService\winhttp\cachev3.dat	svchost.exe

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
4052	schtasks.exe

Modifies data under HKEY_USERS 5 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-19\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\0e-3e-6f-2c-c8-c7\WpadDecision = "0"	svchost.exe
Key created	\REGISTRY\USER\S-1-5-19\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad	svchost.exe
Key created	\REGISTRY\USER\S-1-5-19\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\0e-3e-6f-2c-c8-c7	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-19\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\0e-3e-6f-2c-c8-c7\WpadDecisionReason = "1"	svchost.exe
Set value (data)	\REGISTRY\USER\S-1-5-19\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Wpad\0e-3e-6f-2c-c8-c7\WpadDecisionTime = e8d2c1a2b686d601	svchost.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
728	INVITATION TO BID FOR TENDER.exe
1240	INVITATION TO BID FOR TENDER.exe
1240	INVITATION TO BID FOR TENDER.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeShutdownPrivilege	2680	svchost.exe
Token: SeCreatePagefilePrivilege	2680	svchost.exe
Token: SeDebugPrivilege	728	INVITATION TO BID FOR TENDER.exe
Token: SeDebugPrivilege	1240	INVITATION TO BID FOR TENDER.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1240	INVITATION TO BID FOR TENDER.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 728 wrote to memory of 4052	728	INVITATION TO BID FOR TENDER.exe	77
PID 728 wrote to memory of 4052	728	INVITATION TO BID FOR TENDER.exe	77
PID 728 wrote to memory of 4052	728	INVITATION TO BID FOR TENDER.exe	77
PID 728 wrote to memory of 1240	728	INVITATION TO BID FOR TENDER.exe	79
PID 728 wrote to memory of 1240	728	INVITATION TO BID FOR TENDER.exe	79
PID 728 wrote to memory of 1240	728	INVITATION TO BID FOR TENDER.exe	79
PID 728 wrote to memory of 1240	728	INVITATION TO BID FOR TENDER.exe	79
PID 728 wrote to memory of 1240	728	INVITATION TO BID FOR TENDER.exe	79
PID 728 wrote to memory of 1240	728	INVITATION TO BID FOR TENDER.exe	79
PID 728 wrote to memory of 1240	728	INVITATION TO BID FOR TENDER.exe	79
PID 728 wrote to memory of 1240	728	INVITATION TO BID FOR TENDER.exe	79

C:\Users\Admin\AppData\Local\Temp\INVITATION TO BID FOR TENDER.exe
"C:\Users\Admin\AppData\Local\Temp\INVITATION TO BID FOR TENDER.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:728
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\ChLpAXDNOVPLt" /XML "C:\Users\Admin\AppData\Local\Temp\tmp5753.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:4052
- C:\Users\Admin\AppData\Local\Temp\INVITATION TO BID FOR TENDER.exe
  "C:\Users\Admin\AppData\Local\Temp\INVITATION TO BID FOR TENDER.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:1240

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService -s WinHttpAutoProxySvc
1⤵
- Drops file in Windows directory
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:2680