agenttesla | 69cbd1cde514fa34db916c79d034366b291e3ea63917b52ec76bef88060bfce0

General

Target
Update Account.exe
Size 916KB
Sample201201-p4zmt4mqms
SHA256 69cbd1cde514fa34db916c79d034366b291e3ea63917b52ec76bef88060bfce0
MD5 a744747d06a26e281186248932c42add
SHA1 1cfd2decf0b0696ac8379e7aab991491c580fa15
SHA512 16fbb9f460099d82a7a4c998adbdb614db42722f4ca60b1de463028f4f82a2b6385d828e0e9d3ebc12993c113153a340d51d7e75c049dea249ae392653d3a770
MD5 SHA1 SHA512

Score

10^/10

agenttesla evasion keylogger spyware stealer trojan

Malware Config

Extracted

Credentials

Protocol
smtp
Host
smtp.shirdilog.com
Port
587
Username
[email protected]
Password
SL094521

Extracted

Family

agenttesla

Credentials

Protocol
smtp
Host
smtp.shirdilog.com
Port
587
Username
[email protected]
Password
SL094521

Signatures

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

AgentTesla Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3236-15-0x0000000000400000-0x0000000000466000-memory.dmp	family_agenttesla
behavioral2/memory/3236-16-0x00000000004612BE-mapping.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	Update Account.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Update Account.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	Update Account.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	Update Account.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4048 set thread context of 3236	4048	Update Account.exe	83

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
1336	schtasks.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
412	REG.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
4048	Update Account.exe
4048	Update Account.exe
4048	Update Account.exe
4048	Update Account.exe
4048	Update Account.exe
3236	Update Account.exe
3236	Update Account.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4048	Update Account.exe
Token: SeDebugPrivilege	3236	Update Account.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3236	Update Account.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4048 wrote to memory of 1336	4048	Update Account.exe	79
PID 4048 wrote to memory of 1336	4048	Update Account.exe	79
PID 4048 wrote to memory of 1336	4048	Update Account.exe	79
PID 4048 wrote to memory of 2876	4048	Update Account.exe	81
PID 4048 wrote to memory of 2876	4048	Update Account.exe	81
PID 4048 wrote to memory of 2876	4048	Update Account.exe	81
PID 4048 wrote to memory of 3132	4048	Update Account.exe	82
PID 4048 wrote to memory of 3132	4048	Update Account.exe	82
PID 4048 wrote to memory of 3132	4048	Update Account.exe	82
PID 4048 wrote to memory of 3236	4048	Update Account.exe	83
PID 4048 wrote to memory of 3236	4048	Update Account.exe	83
PID 4048 wrote to memory of 3236	4048	Update Account.exe	83
PID 4048 wrote to memory of 3236	4048	Update Account.exe	83
PID 4048 wrote to memory of 3236	4048	Update Account.exe	83
PID 4048 wrote to memory of 3236	4048	Update Account.exe	83
PID 4048 wrote to memory of 3236	4048	Update Account.exe	83
PID 4048 wrote to memory of 3236	4048	Update Account.exe	83
PID 3236 wrote to memory of 412	3236	Update Account.exe	84
PID 3236 wrote to memory of 412	3236	Update Account.exe	84
PID 3236 wrote to memory of 412	3236	Update Account.exe	84

C:\Users\Admin\AppData\Local\Temp\Update Account.exe
"C:\Users\Admin\AppData\Local\Temp\Update Account.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:4048
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\TYWsVVybv" /XML "C:\Users\Admin\AppData\Local\Temp\tmpFBBB.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1336
- C:\Users\Admin\AppData\Local\Temp\Update Account.exe
  "{path}"
  2⤵
  PID:2876
- C:\Users\Admin\AppData\Local\Temp\Update Account.exe
  "{path}"
  2⤵
  PID:3132
- C:\Users\Admin\AppData\Local\Temp\Update Account.exe
  "{path}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3236
- - C:\Windows\SysWOW64\REG.exe
    REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer / v NoRun / t REG_DWORD / d 1 / f
    3⤵
    - Modifies registry key
    PID:412