agenttesla | 63c91fa1eade0720aaaafadc134c2ccaa9e541b444fbd2a8d33f446d2761bc77

Analysis

max time kernel
4294180s
max time network
122s
platform
windows7_x64
resource
win7-20220311-en
submitted
28/03/2022, 21:06

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General

Target
DEBIT NOTE.exe
Size 558KB
Sample220328-zxp2pabcbl
SHA256 63c91fa1eade0720aaaafadc134c2ccaa9e541b444fbd2a8d33f446d2761bc77
MD5 beee18b159bb132feaab3c5c3c17a473
SHA1 ebd9a2575b4c16e317b11719efecdf60a3e8c487
SHA512 66c85e5c5241501eff7497e2ed2d88b8e2ea7eeda003911c652b4375614aa2fe4c8665f49fa417b1185ffa20a69e954b104b5b2d419fcda90859eb34a5c44f90
MD5 SHA1 SHA512

Score

10^/10

agenttesla collection evasion keylogger spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

https://api.telegram.org/bot1562684159:AAF0RHsedAMUFPfvPk6IyrreCEPxQ_b3Y3g/sendDocument

Signatures

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

AgentTesla Payload 6 IoCs

resource	yara_rule
behavioral1/memory/296-63-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/296-64-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/296-65-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/296-66-0x00000000004375FE-mapping.dmp	family_agenttesla
behavioral1/memory/296-70-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/296-68-0x0000000000400000-0x000000000043C000-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	DEBIT NOTE.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	DEBIT NOTE.exe

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

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 stealer

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 stealer

Data from Local System
T1005

Credentials in Files
T1081

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	DEBIT NOTE.exe
Key opened	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	DEBIT NOTE.exe
Key opened	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	DEBIT NOTE.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 opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	DEBIT NOTE.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	DEBIT NOTE.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1636 set thread context of 296	1636	DEBIT NOTE.exe	30

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
1872	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
296	DEBIT NOTE.exe
296	DEBIT NOTE.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	296	DEBIT NOTE.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1636 wrote to memory of 1872	1636	DEBIT NOTE.exe	28
PID 1636 wrote to memory of 1872	1636	DEBIT NOTE.exe	28
PID 1636 wrote to memory of 1872	1636	DEBIT NOTE.exe	28
PID 1636 wrote to memory of 1872	1636	DEBIT NOTE.exe	28
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30
PID 1636 wrote to memory of 296	1636	DEBIT NOTE.exe	30

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	DEBIT NOTE.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	DEBIT NOTE.exe

C:\Users\Admin\AppData\Local\Temp\DEBIT NOTE.exe
"C:\Users\Admin\AppData\Local\Temp\DEBIT NOTE.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1636
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\dBhKzJp" /XML "C:\Users\Admin\AppData\Local\Temp\tmpB1E1.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1872
- C:\Users\Admin\AppData\Local\Temp\DEBIT NOTE.exe
  "{path}"
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - outlook_office_path
  - outlook_win_path
  PID:296

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Credentials in Files

T1081

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

tmpB1E1.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmpB1E1.tmp
Size 1KB
SHA256 ae00fcb8c4406ef0af5569b51a454892e9bf49a6a4fca082d06d9c36b240f187
MD5 41588e2b7f0dd740a77d8fdd923fdb37
SHA1 48275873003a8ae52608e893c6b4218ad83b61ed
SHA512 7eed89ddf091e648c605620b6049d5c00d30122f60bc4d5567f69343fdad33655e03952bc7f9f1a51a37928a2555da3b1f983895e4e1ce508949acc53d382200
MD5 SHA1 SHA512

Submit Download

memory/296-64-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/296-60-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/296-61-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/296-63-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/296-65-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/296-70-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/296-68-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/1636-56-0x0000000004930000-0x00000000049B4000-memory.dmp

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memory/1636-57-0x0000000001F50000-0x0000000001F8C000-memory.dmp

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memory/1636-55-0x0000000000260000-0x000000000026A000-memory.dmp

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memory/1636-54-0x0000000000320000-0x00000000003B2000-memory.dmp

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