blustealer | ea363893bfddb8b28e3030fb25ffb842dd466c82ef496b39f9c883feb1b42f41

General

Target

Purchase order_pdf.exe
Size

792KB
MD5

3b156e7eab24fbf17d682c7d889b85d6
SHA1

4385230e53f255d7db8b91844f2c67f1b16c1c96
SHA256

c26bf76c00885577a5aeacd05387893d936bf122aaf3999dcb0dee3be14fcfcd
SHA512

879a687179a41ece511e833f967a9d2ab6daa937c4339237fb07735fa53f09bfd6978bca4115af7e51b496e0b323df9bdd5f185029a637550c6b2901d4873bb1
SSDEEP

12288:XAOsOorAeJPzsJnxfBN9UpRQQ2FDTm3U+o1N68vlU0WhmtVSkYRUVmU:XAOcr5axfBYp6fDMkzRiQVSkYqm

Score

10^/10

blustealer collection stealer

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5450700540:AAEJyEEV8BKgYUKmnCPZxp19kD9GVSRup5M/sendMessage?chat_id=5422342474

Signatures

BluStealer
A Modular information stealer written in Visual Basic.
stealer blustealer

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3260 set thread context of 3720	3260	Purchase order_pdf.exe	92
PID 3720 set thread context of 3692	3720	Purchase order_pdf.exe	93

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

System Information Discovery
T1082

Script User-Agent 1 IoCs

Uses user-agent string associated with script host/environment.

description	flow	ioc
HTTP User-Agent header	37	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3260	Purchase order_pdf.exe
3260	Purchase order_pdf.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3260	Purchase order_pdf.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3720	Purchase order_pdf.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3260 wrote to memory of 3764	3260	Purchase order_pdf.exe	91
PID 3260 wrote to memory of 3764	3260	Purchase order_pdf.exe	91
PID 3260 wrote to memory of 3764	3260	Purchase order_pdf.exe	91
PID 3260 wrote to memory of 3720	3260	Purchase order_pdf.exe	92
PID 3260 wrote to memory of 3720	3260	Purchase order_pdf.exe	92
PID 3260 wrote to memory of 3720	3260	Purchase order_pdf.exe	92
PID 3260 wrote to memory of 3720	3260	Purchase order_pdf.exe	92
PID 3260 wrote to memory of 3720	3260	Purchase order_pdf.exe	92
PID 3260 wrote to memory of 3720	3260	Purchase order_pdf.exe	92
PID 3260 wrote to memory of 3720	3260	Purchase order_pdf.exe	92
PID 3260 wrote to memory of 3720	3260	Purchase order_pdf.exe	92
PID 3720 wrote to memory of 3692	3720	Purchase order_pdf.exe	93
PID 3720 wrote to memory of 3692	3720	Purchase order_pdf.exe	93
PID 3720 wrote to memory of 3692	3720	Purchase order_pdf.exe	93
PID 3720 wrote to memory of 3692	3720	Purchase order_pdf.exe	93
PID 3720 wrote to memory of 3692	3720	Purchase order_pdf.exe	93

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\Purchase order_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Purchase order_pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3260
- C:\Users\Admin\AppData\Local\Temp\Purchase order_pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Purchase order_pdf.exe"
  2⤵
  PID:3764
- C:\Users\Admin\AppData\Local\Temp\Purchase order_pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Purchase order_pdf.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3720
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
    3⤵
    - Accesses Microsoft Outlook profiles
    - outlook_office_path
    - outlook_win_path
    PID:3692

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3260-133-0x0000000000A90000-0x0000000000B5C000-memory.dmp

Filesize
816KB

Download
memory/3260-134-0x0000000005B00000-0x00000000060A4000-memory.dmp

Filesize
5.6MB

Download
memory/3260-135-0x0000000005550000-0x00000000055E2000-memory.dmp

Filesize
584KB

Download
memory/3260-136-0x0000000005500000-0x000000000550A000-memory.dmp

Filesize
40KB

Download
memory/3260-137-0x0000000005490000-0x00000000054A0000-memory.dmp

Filesize
64KB

Download
memory/3260-138-0x0000000005490000-0x00000000054A0000-memory.dmp

Filesize
64KB

Download
memory/3260-139-0x00000000086A0000-0x000000000873C000-memory.dmp

Filesize
624KB

Download
memory/3692-147-0x0000000000F00000-0x0000000000F66000-memory.dmp

Filesize
408KB

Download
memory/3720-140-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/3720-143-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/3720-146-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/3720-149-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download

Analysis

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