agenttesla | c87b319c28a538e76b2f86f21b68efa15581c90c727d36d4fd415a9d899e59dd

General

Target
WO-File.PDF.exe
Size 416KB
Sample201109-n57fvdjvte
SHA256 c87b319c28a538e76b2f86f21b68efa15581c90c727d36d4fd415a9d899e59dd
MD5 20a70b9509a96449ec99e50fa5824fed
SHA1 7bed798c0c3cf3f63271a9adb8a281c14dd9da6b
SHA512 ba1f0feba08612a7ae6b41d6ee2dfa867508e347002dcb9250063d2103f6f5fb6f50602c717b223b82610b39f2965e8851fdf1eeeb02865a7fd49709bdba6c99
MD5 SHA1 SHA512

Score

10^/10

agenttesla evasion keylogger persistence rezer0 spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol
smtp
Host
mail.pro-powersourcing.com
Port
587
Username
[email protected]
Password
china1977

Signatures

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

AgentTesla Payload 15 IoCs

resource	yara_rule
behavioral2/memory/4032-12-0x0000000000400000-0x0000000000452000-memory.dmp	family_agenttesla
behavioral2/memory/4032-13-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-28-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-29-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-27-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-30-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-31-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-32-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-33-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-34-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-35-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-36-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-26-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-25-0x000000000044CE0E-mapping.dmp	family_agenttesla
behavioral2/memory/4032-24-0x000000000044CE0E-mapping.dmp	family_agenttesla

Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

rezer0 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

resource	yara_rule
behavioral2/memory/3636-8-0x0000000008680000-0x00000000086D3000-memory.dmp	rezer0

Disables Task Manager via registry modification
evasion

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	RegSvcs.exe

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	WO-File.PDF.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	WO-File.PDF.exe

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-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\CpSnJ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\CpSnJ\\CpSnJ.exe"	RegSvcs.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	WO-File.PDF.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	WO-File.PDF.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3636 set thread context of 4032	3636	WO-File.PDF.exe	81

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3708	4032	WerFault.exe	81

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
3464	schtasks.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
2304	REG.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
3636	WO-File.PDF.exe
4032	RegSvcs.exe
4032	RegSvcs.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe
3708	WerFault.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3636	WO-File.PDF.exe
Token: SeDebugPrivilege	4032	RegSvcs.exe
Token: SeRestorePrivilege	3708	WerFault.exe
Token: SeBackupPrivilege	3708	WerFault.exe
Token: SeDebugPrivilege	3708	WerFault.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3636 wrote to memory of 3464	3636	WO-File.PDF.exe	79
PID 3636 wrote to memory of 3464	3636	WO-File.PDF.exe	79
PID 3636 wrote to memory of 3464	3636	WO-File.PDF.exe	79
PID 3636 wrote to memory of 4032	3636	WO-File.PDF.exe	81
PID 3636 wrote to memory of 4032	3636	WO-File.PDF.exe	81
PID 3636 wrote to memory of 4032	3636	WO-File.PDF.exe	81
PID 3636 wrote to memory of 4032	3636	WO-File.PDF.exe	81
PID 3636 wrote to memory of 4032	3636	WO-File.PDF.exe	81
PID 3636 wrote to memory of 4032	3636	WO-File.PDF.exe	81
PID 3636 wrote to memory of 4032	3636	WO-File.PDF.exe	81
PID 3636 wrote to memory of 4032	3636	WO-File.PDF.exe	81
PID 4032 wrote to memory of 2304	4032	RegSvcs.exe	82
PID 4032 wrote to memory of 2304	4032	RegSvcs.exe	82
PID 4032 wrote to memory of 2304	4032	RegSvcs.exe	82
PID 4032 wrote to memory of 2500	4032	RegSvcs.exe	84
PID 4032 wrote to memory of 2500	4032	RegSvcs.exe	84
PID 4032 wrote to memory of 2500	4032	RegSvcs.exe	84

C:\Users\Admin\AppData\Local\Temp\WO-File.PDF.exe
"C:\Users\Admin\AppData\Local\Temp\WO-File.PDF.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:3636
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\vXRfOWVZyW" /XML "C:\Users\Admin\AppData\Local\Temp\tmpC44F.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:3464
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
  "{path}"
  2⤵
  - Drops file in Drivers directory
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4032
- - C:\Windows\SysWOW64\REG.exe
    REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
    3⤵
    - Modifies registry key
    PID:2304
- - C:\Windows\SysWOW64\netsh.exe
    "netsh" wlan show profile
    3⤵
    PID:2500
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4032 -s 1516
    3⤵
    - Program crash
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3708