blustealer | 36c9af5b5712f266baac8963ca365fa3d3b40f8ef1cbfdd4784612d4685d3cc5

General

Target

Specification.exe
Size

1.4MB
MD5

75c4f755670d62947bf2dabb7857165c
SHA1

a86c8680456b8e12ea0e6f5c29622191064b9c6a
SHA256

36c9af5b5712f266baac8963ca365fa3d3b40f8ef1cbfdd4784612d4685d3cc5
SHA512

3f8dbedfb5f29810ef9be65f479afecd18c8d62d5a930dd099f3224425adc29b6f601a88ea3d6f3f81ec37b72788495665a2c6375378da688d33fb44a4160022
SSDEEP

24576:44oTw9wQsp66R9MFPALm68hFYQdAIzQkkZbL0NOzfiUMmdB:l9KpDRsAiTDZcZAefiUMm

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-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3544 set thread context of 2228	3544	Specification.exe	94
PID 2228 set thread context of 1716	2228	Specification.exe	95

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	52	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3544	Specification.exe
3544	Specification.exe
3544	Specification.exe
3544	Specification.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3544	Specification.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2228	Specification.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 3544 wrote to memory of 3388	3544	Specification.exe	92
PID 3544 wrote to memory of 3388	3544	Specification.exe	92
PID 3544 wrote to memory of 3388	3544	Specification.exe	92
PID 3544 wrote to memory of 2396	3544	Specification.exe	93
PID 3544 wrote to memory of 2396	3544	Specification.exe	93
PID 3544 wrote to memory of 2396	3544	Specification.exe	93
PID 3544 wrote to memory of 2228	3544	Specification.exe	94
PID 3544 wrote to memory of 2228	3544	Specification.exe	94
PID 3544 wrote to memory of 2228	3544	Specification.exe	94
PID 3544 wrote to memory of 2228	3544	Specification.exe	94
PID 3544 wrote to memory of 2228	3544	Specification.exe	94
PID 3544 wrote to memory of 2228	3544	Specification.exe	94
PID 3544 wrote to memory of 2228	3544	Specification.exe	94
PID 3544 wrote to memory of 2228	3544	Specification.exe	94
PID 2228 wrote to memory of 1716	2228	Specification.exe	95
PID 2228 wrote to memory of 1716	2228	Specification.exe	95
PID 2228 wrote to memory of 1716	2228	Specification.exe	95
PID 2228 wrote to memory of 1716	2228	Specification.exe	95
PID 2228 wrote to memory of 1716	2228	Specification.exe	95

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\Specification.exe
"C:\Users\Admin\AppData\Local\Temp\Specification.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3544
- C:\Users\Admin\AppData\Local\Temp\Specification.exe
  "C:\Users\Admin\AppData\Local\Temp\Specification.exe"
  2⤵
  PID:3388
- C:\Users\Admin\AppData\Local\Temp\Specification.exe
  "C:\Users\Admin\AppData\Local\Temp\Specification.exe"
  2⤵
  PID:2396
- C:\Users\Admin\AppData\Local\Temp\Specification.exe
  "C:\Users\Admin\AppData\Local\Temp\Specification.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2228
- - 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:1716

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/1716-148-0x0000000000B00000-0x0000000000B66000-memory.dmp

Filesize
408KB

Download
memory/2228-149-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/2228-146-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/2228-143-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/2228-141-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/3544-132-0x00000000006D0000-0x000000000083C000-memory.dmp

Filesize
1.4MB

Download
memory/3544-137-0x00000000010B0000-0x0000000001116000-memory.dmp

Filesize
408KB

Download
memory/3544-136-0x0000000001010000-0x00000000010AC000-memory.dmp

Filesize
624KB

Download
memory/3544-135-0x00000000051B0000-0x00000000051BA000-memory.dmp

Filesize
40KB

Download
memory/3544-134-0x0000000005230000-0x00000000052C2000-memory.dmp

Filesize
584KB

Download
memory/3544-133-0x00000000057E0000-0x0000000005D84000-memory.dmp

Filesize
5.6MB

Download

Analysis

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