agenttesla | 7d47f11a565adc0b68333cdc0a70dfc6748a200c2a85bdada22d4c23545dcb56

Analysis

max time kernel
105s
max time network
110s
platform
windows10_x64
resource
win10
submitted
28/08/2020, 21:26

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General

Target
dek.txt.exe
Size 677KB
Sample200828-ec4dd2g2l2
SHA256 7d47f11a565adc0b68333cdc0a70dfc6748a200c2a85bdada22d4c23545dcb56
MD5 062dc73ac4a7babfe4acfd2de9a5e781
SHA1 9b118d2837442ee3ebb52af8262e8eb84f41fede
SHA512 d0fa73c9a93957856dcc0ff4ef7cc64d6d9171d833a7bcc2f82d26423bae8cfd5c59682725eae3a7c9e35cc1f9d8d8ce011e93e1626a1dd3752eeaf20ce65d40
MD5 SHA1 SHA512

Score

10^/10

agenttesla evasion keylogger spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol
smtp
Host
mail.privateemail.com
Port
587
Username
[email protected]
Password
AugustBlessings@

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/3532-12-0x0000000000400000-0x0000000000466000-memory.dmp	family_agenttesla
behavioral2/memory/3532-13-0x000000000046113E-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	dek.txt.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	dek.txt.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	dek.txt.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	dek.txt.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3984 set thread context of 3532	3984	dek.txt.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

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
2460	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\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 = 148d8f58817dd601	svchost.exe
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

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3984	dek.txt.exe
3984	dek.txt.exe
3984	dek.txt.exe
3984	dek.txt.exe
3532	RegSvcs.exe
3532	RegSvcs.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeShutdownPrivilege	696	svchost.exe
Token: SeCreatePagefilePrivilege	696	svchost.exe
Token: SeDebugPrivilege	3984	dek.txt.exe
Token: SeDebugPrivilege	3532	RegSvcs.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3532	RegSvcs.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 3984 wrote to memory of 2460	3984	dek.txt.exe	77
PID 3984 wrote to memory of 2460	3984	dek.txt.exe	77
PID 3984 wrote to memory of 2460	3984	dek.txt.exe	77
PID 3984 wrote to memory of 3532	3984	dek.txt.exe	79
PID 3984 wrote to memory of 3532	3984	dek.txt.exe	79
PID 3984 wrote to memory of 3532	3984	dek.txt.exe	79
PID 3984 wrote to memory of 3532	3984	dek.txt.exe	79
PID 3984 wrote to memory of 3532	3984	dek.txt.exe	79
PID 3984 wrote to memory of 3532	3984	dek.txt.exe	79
PID 3984 wrote to memory of 3532	3984	dek.txt.exe	79
PID 3984 wrote to memory of 3532	3984	dek.txt.exe	79

C:\Users\Admin\AppData\Local\Temp\dek.txt.exe
"C:\Users\Admin\AppData\Local\Temp\dek.txt.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:3984
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\lXyKhhUV" /XML "C:\Users\Admin\AppData\Local\Temp\tmp1415.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:2460
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
  "{path}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:3532

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:696

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

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/3532-22-0x0000000006680000-0x0000000006681000-memory.dmp

Download

memory/3532-19-0x00000000053E0000-0x00000000053E1000-memory.dmp

Download

memory/3532-17-0x0000000005AD0000-0x0000000005AD1000-memory.dmp

Download

memory/3532-14-0x0000000073410000-0x0000000073AFE000-memory.dmp

Download

memory/3532-12-0x0000000000400000-0x0000000000466000-memory.dmp

Download

memory/3984-5-0x0000000005C30000-0x0000000005C31000-memory.dmp

Download

memory/3984-9-0x0000000001400000-0x0000000001401000-memory.dmp

Download

memory/3984-8-0x000000000BE70000-0x000000000BE71000-memory.dmp

Download

memory/3984-7-0x0000000008660000-0x00000000086E3000-memory.dmp

Download

memory/3984-6-0x0000000005FF0000-0x000000000607E000-memory.dmp

Download

memory/3984-0-0x0000000073410000-0x0000000073AFE000-memory.dmp

Download

memory/3984-4-0x00000000055B0000-0x00000000055B1000-memory.dmp

Download

memory/3984-3-0x0000000002F80000-0x0000000002F87000-memory.dmp

Download

memory/3984-1-0x0000000000CF0000-0x0000000000CF1000-memory.dmp

Download