agenttesla | 4da86275e812956ff0873926fc947334e4a398a623241028babaabf252a2ea0e

General

Target

ungziped_file.exe
Size

504KB
MD5

4e779addb4aeb32182ad139fdf0b5045
SHA1

8313c21225aaaa03d09947843d44e33d3e513257
SHA256

4da86275e812956ff0873926fc947334e4a398a623241028babaabf252a2ea0e
SHA512

a603d57a958c815c5c353fb18c150325bd614ab2b708ceadce6677f6dc5cd324ce668e90edfa5e23113604d43764a639daac7f1d73cf93236eee93cba08f63bc
SSDEEP

12288:nz9GxaChlC3qKOcVbNUW+YCt/JSyhtrVtYHe4P1vg:cC3iKNUWuSyhtTYH7P1g

Score

10^/10

agenttesla guloader collection downloader keylogger spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol: ftp
Host:
ftp://ftp.homesteadgroove.com
Port:
21
Username:
[email protected]
Password:
430M=DwOtIfm

Signatures

AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
keylogger trojan stealer spyware agenttesla
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

Processes:

ungziped_file.execaspol.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	ungziped_file.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	caspol.exe

Loads dropped DLL 1 IoCs

Processes:

ungziped_file.exe

pid process

1980 ungziped_file.exe

pid	process
1980	ungziped_file.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

caspol.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.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.

Processes:

flow ioc

6 api.ipify.org
7 api.ipify.org
Drops file in System32 directory 1 IoCs

Processes:

ungziped_file.exe

description ioc process

File opened for modification C:\Windows\SysWOW64\Corymbosely.For ungziped_file.exe
Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

Processes:

caspol.exe

pid process

2004 caspol.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

ungziped_file.execaspol.exe

pid process

1980 ungziped_file.exe
2004 caspol.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ungziped_file.exe

description pid process target process

PID 1980 set thread context of 2004 1980 ungziped_file.exe caspol.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

ungziped_file.exe

pid process

1980 ungziped_file.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

caspol.exe

description pid process

Token: SeDebugPrivilege 2004 caspol.exe

flow	ioc
6	api.ipify.org
7	api.ipify.org

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\Corymbosely.For	ungziped_file.exe

pid	process
2004	caspol.exe

pid	process
1980	ungziped_file.exe
2004	caspol.exe

description	pid	process	target process
PID 1980 set thread context of 2004	1980	ungziped_file.exe	caspol.exe

pid	process
1980	ungziped_file.exe

description	pid	process
Token: SeDebugPrivilege	2004	caspol.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

ungziped_file.exe

description	pid	process	target process
PID 1980 wrote to memory of 2004	1980	ungziped_file.exe	caspol.exe
PID 1980 wrote to memory of 2004	1980	ungziped_file.exe	caspol.exe
PID 1980 wrote to memory of 2004	1980	ungziped_file.exe	caspol.exe
PID 1980 wrote to memory of 2004	1980	ungziped_file.exe	caspol.exe
PID 1980 wrote to memory of 2004	1980	ungziped_file.exe	caspol.exe

outlook_office_path 1 IoCs

Processes:

caspol.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe

outlook_win_path 1 IoCs

Processes:

caspol.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	caspol.exe

C:\Users\Admin\AppData\Local\Temp\ungziped_file.exe
"C:\Users\Admin\AppData\Local\Temp\ungziped_file.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1980
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\caspol.exe
  "C:\Users\Admin\AppData\Local\Temp\ungziped_file.exe"
  2⤵
  - Checks QEMU agent file
  - Accesses Microsoft Outlook profiles
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of AdjustPrivilegeToken
  - outlook_office_path
  - outlook_win_path
  PID:2004

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Local\Temp\nso1816.tmp\System.dll

Filesize
11KB

MD5
17ed1c86bd67e78ade4712be48a7d2bd

SHA1
1cc9fe86d6d6030b4dae45ecddce5907991c01a0

SHA256
bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

SHA512
0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

Download Submit
memory/1980-64-0x0000000003840000-0x00000000067F0000-memory.dmp

Filesize
47.7MB

Download
memory/1980-65-0x0000000003840000-0x00000000067F0000-memory.dmp

Filesize
47.7MB

Download
memory/2004-66-0x0000000001270000-0x0000000004220000-memory.dmp

Filesize
47.7MB

Download
memory/2004-67-0x0000000000400000-0x0000000000615000-memory.dmp

Filesize
2.1MB

Download
memory/2004-68-0x0000000000400000-0x0000000000615000-memory.dmp

Filesize
2.1MB

Download
memory/2004-69-0x0000000001270000-0x0000000004220000-memory.dmp

Filesize
47.7MB

Download
memory/2004-70-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/2004-71-0x0000000001270000-0x0000000004220000-memory.dmp

Filesize
47.7MB

Download
memory/2004-73-0x0000000036A00000-0x0000000036A40000-memory.dmp

Filesize
256KB

Download
memory/2004-92-0x0000000036A00000-0x0000000036A40000-memory.dmp

Filesize
256KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads