agenttesla | 4fcbdbe09122e5dc33f831e7e65c39cab03b67e70e4d8f5d3c225a8c88c7fb7d

Analysis

max time kernel
143s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
13/02/2024, 02:32

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General

Target

Ynstr.exe
Size

718KB
MD5

43a00ef10637139c060f1139df3b9cc1
SHA1

f717df8434925d25e03512c91385bc528576339e
SHA256

f2a3d321b3fbb2d3be23e5416a82b92d9aa73c3573ef0630d0570483ced8a731
SHA512

19c9ea8f334c2ff21ae39339e94603f7245feb67784d22ab551c809d8d7dd364941b18c8e649476b9a260d89f8005ba9ebb5b9baf401327ef6c6a44c33602bbc
SSDEEP

12288:RCcj8EhT1GrAjbadQSIVCXfUWQBZoeAfeDlV25x3nGxYcBa8k:Icj8EzCdQSIkXsWQE4lV259Gx

Score

10^/10

agenttesla zgrat keylogger persistence rat spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol: smtp
Host:
mail.emulines.biz
Port:
587
Username:
[email protected]
Password:
7FZLGL7DTG0F
Email To:
[email protected]

Signatures

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

Detect ZGRat V1 34 IoCs

resource	yara_rule
behavioral2/memory/3424-2-0x00000000055F0000-0x00000000056A8000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-8-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-6-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-10-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-5-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-12-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-22-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-32-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-38-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-44-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-50-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-48-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-54-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-56-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-60-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-58-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-62-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-52-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-64-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-66-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-46-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-68-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-42-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-40-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-36-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-34-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-30-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-28-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-26-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-24-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-20-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-18-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-16-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1
behavioral2/memory/3424-14-0x00000000055F0000-0x00000000056A2000-memory.dmp	family_zgrat_v1

ZGRat
ZGRat is remote access trojan written in C#.
rat zgrat

Detect packed .NET executables. Mostly AgentTeslaV4. 1 IoCs

resource	yara_rule
behavioral2/memory/2348-1128-0x0000000000400000-0x0000000000442000-memory.dmp	INDICATOR_EXE_Packed_GEN01

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 1 IoCs

resource	yara_rule
behavioral2/memory/2348-1128-0x0000000000400000-0x0000000000442000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables referencing Windows vault credential objects. Observed in infostealers 1 IoCs

resource	yara_rule
behavioral2/memory/2348-1128-0x0000000000400000-0x0000000000442000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_VaultSchemaGUID

Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers 1 IoCs

resource	yara_rule
behavioral2/memory/2348-1128-0x0000000000400000-0x0000000000442000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_References_Confidential_Data_Store

Detects executables referencing many email and collaboration clients. Observed in information stealers 1 IoCs

resource	yara_rule
behavioral2/memory/2348-1128-0x0000000000400000-0x0000000000442000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_References_Messaging_Clients

Detects executables referencing many file transfer clients. Observed in information stealers 1 IoCs

resource	yara_rule
behavioral2/memory/2348-1128-0x0000000000400000-0x0000000000442000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_Referenfces_File_Transfer_Clients

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
T1552.001
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
T1552.001
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
T1552.001

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3336304223-2978740688-3645194410-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Mtwbsyxsy = "C:\\Users\\Admin\\AppData\\Roaming\\Mtwbsyxsy.exe"	Ynstr.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3336304223-2978740688-3645194410-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sBRfm = "C:\\Users\\Admin\\AppData\\Roaming\\sBRfm\\sBRfm.exe"	Ynstr.exe

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
16	api.ipify.org
17	api.ipify.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3424 set thread context of 2348	3424	Ynstr.exe	84

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2348	Ynstr.exe
2348	Ynstr.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3424	Ynstr.exe
Token: SeDebugPrivilege	2348	Ynstr.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3424 wrote to memory of 2348	3424	Ynstr.exe	84
PID 3424 wrote to memory of 2348	3424	Ynstr.exe	84
PID 3424 wrote to memory of 2348	3424	Ynstr.exe	84
PID 3424 wrote to memory of 2348	3424	Ynstr.exe	84
PID 3424 wrote to memory of 2348	3424	Ynstr.exe	84
PID 3424 wrote to memory of 2348	3424	Ynstr.exe	84
PID 3424 wrote to memory of 2348	3424	Ynstr.exe	84
PID 3424 wrote to memory of 2348	3424	Ynstr.exe	84

C:\Users\Admin\AppData\Local\Temp\Ynstr.exe
"C:\Users\Admin\AppData\Local\Temp\Ynstr.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3424
- C:\Users\Admin\AppData\Local\Temp\Ynstr.exe
  C:\Users\Admin\AppData\Local\Temp\Ynstr.exe
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2348

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Ynstr.exe.log

Filesize
1KB

MD5
b3b3daebe9fafdfde1f7a2c832331167

SHA1
5603b8544b1558b27c2581b11c23dda16dd1865a

SHA256
94d1a08013bee7bf54c208d9fd1037041143f422832723071f7f6435fdc3c6ed

SHA512
4b439f2dd06404c9e514f111ab99ed502304bcd1a8d674819c380ad79ac2f9f83b78e835115f7c49d2629d0e5e1b82c36fe81d698c46fc2264238fe52c5af7cb

Download Submit
memory/2348-1128-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2348-1129-0x0000000074B90000-0x0000000075340000-memory.dmp

Filesize
7.7MB

Download
memory/2348-1131-0x0000000005210000-0x0000000005220000-memory.dmp

Filesize
64KB

Download
memory/2348-1132-0x0000000005290000-0x00000000052F6000-memory.dmp

Filesize
408KB

Download
memory/2348-1139-0x0000000006AC0000-0x0000000006ACA000-memory.dmp

Filesize
40KB

Download
memory/2348-1138-0x0000000006B30000-0x0000000006BC2000-memory.dmp

Filesize
584KB

Download
memory/2348-1137-0x0000000005210000-0x0000000005220000-memory.dmp

Filesize
64KB

Download
memory/2348-1136-0x0000000074B90000-0x0000000075340000-memory.dmp

Filesize
7.7MB

Download
memory/2348-1135-0x00000000069F0000-0x0000000006A8C000-memory.dmp

Filesize
624KB

Download
memory/2348-1134-0x0000000006900000-0x0000000006950000-memory.dmp

Filesize
320KB

Download
memory/3424-52-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-40-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-5-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-12-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-22-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-32-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-38-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-44-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-50-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-48-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-54-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-56-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-60-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-58-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-62-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-6-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-64-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-66-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-46-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-68-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-42-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-10-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-36-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-34-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-30-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-28-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-26-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-24-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-20-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-18-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-16-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-14-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-1120-0x0000000005760000-0x0000000005761000-memory.dmp

Filesize
4KB

Download
memory/3424-1119-0x0000000005790000-0x00000000057A0000-memory.dmp

Filesize
64KB

Download
memory/3424-1122-0x0000000005A70000-0x0000000005ABC000-memory.dmp

Filesize
304KB

Download
memory/3424-8-0x00000000055F0000-0x00000000056A2000-memory.dmp

Filesize
712KB

Download
memory/3424-4-0x00000000058B0000-0x00000000059BA000-memory.dmp

Filesize
1.0MB

Download
memory/3424-3-0x0000000005DC0000-0x00000000063D8000-memory.dmp

Filesize
6.1MB

Download
memory/3424-2-0x00000000055F0000-0x00000000056A8000-memory.dmp

Filesize
736KB

Download
memory/3424-1-0x0000000000D10000-0x0000000000DCA000-memory.dmp

Filesize
744KB

Download
memory/3424-0-0x0000000074B90000-0x0000000075340000-memory.dmp

Filesize
7.7MB

Download
memory/3424-1121-0x00000000059E0000-0x0000000005A22000-memory.dmp

Filesize
264KB

Download
memory/3424-1123-0x0000000006990000-0x0000000006F34000-memory.dmp

Filesize
5.6MB

Download
memory/3424-1130-0x0000000074B90000-0x0000000075340000-memory.dmp

Filesize
7.7MB

Download