agenttesla | 96c4bcff0df93379d1447731b9fd7738ded981e16b2a646668ae1bed2f72a320

General

Target
Purchase Order.exe
Size 651KB
Sample201005-2wt17xs8sn
SHA256 96c4bcff0df93379d1447731b9fd7738ded981e16b2a646668ae1bed2f72a320
MD5 34c376ab2eb52f955813d6a445c23e8d
SHA1 a3f4a4d19b2d7b1eb8031142f83a67fe0b442b16
SHA512 b139be35f31d2c865058f7a5d4e4d205b147a37d1c430aa4b4110f865decce0a662840b412a4d15028bfb9833422d328ecd1a76c1a589e613737cb56555b0548
MD5 SHA1 SHA512

Score

10^/10

agenttesla evasion keylogger spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol
smtp
Host
mail.swedish-hospital.com
Port
587
Username
[email protected]
Password
Swe2017?

Signatures

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

AgentTesla Payload 4 IoCs

resource	yara_rule
behavioral1/memory/1316-8-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/1316-9-0x000000000043765E-mapping.dmp	family_agenttesla
behavioral1/memory/1316-10-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/1316-11-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla

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	Purchase Order.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Purchase Order.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

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	api.ipify.org
5	api.ipify.org

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	Purchase Order.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	Purchase Order.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1424 set thread context of 1316	1424	Purchase Order.exe	31

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
1896	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1424	Purchase Order.exe
1424	Purchase Order.exe
1424	Purchase Order.exe
1316	Purchase Order.exe
1316	Purchase Order.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1424	Purchase Order.exe
Token: SeDebugPrivilege	1316	Purchase Order.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1424 wrote to memory of 1896	1424	Purchase Order.exe	29
PID 1424 wrote to memory of 1896	1424	Purchase Order.exe	29
PID 1424 wrote to memory of 1896	1424	Purchase Order.exe	29
PID 1424 wrote to memory of 1896	1424	Purchase Order.exe	29
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31
PID 1424 wrote to memory of 1316	1424	Purchase Order.exe	31

C:\Users\Admin\AppData\Local\Temp\Purchase Order.exe
"C:\Users\Admin\AppData\Local\Temp\Purchase Order.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:1424
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nVBSuBHZh" /XML "C:\Users\Admin\AppData\Local\Temp\tmpD559.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1896
- C:\Users\Admin\AppData\Local\Temp\Purchase Order.exe
  "{path}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1316