blustealer | 068a5a6741c0bf5326cdce7e406c5273340ad1c9f4371fadeb88bf794f1d91e6

General

Target
SecuriteInfo.com.Variant.Ursu.725994.7033.exe
Size 310KB
Sample220504-mpdmgadfb3
SHA256 068a5a6741c0bf5326cdce7e406c5273340ad1c9f4371fadeb88bf794f1d91e6
MD5 de33d5d7aba21105223e13bb8a876f7a
SHA1 00b5cb90bfa6afdc09273e13f9b83fd5513e7e44
SHA512 0ca72094cd8c18c81c91f73b8fd386f0dcb306f317665896570e55e3500de048bcfa5f0e1858339e9fc551045f9649e1c504c65f206348d0cbad7dc55c349e3d
MD5 SHA1 SHA512

Score

10^/10

blustealer collection persistence stealer

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5196367687:AAFQMFaS-BkGAqcvbLlF32Aj913Yy9Y9iFI/sendMessage?chat_id=1293496579

Signatures

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	SecuriteInfo.com.Variant.Ursu.725994.7033.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.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-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Iwnupa = "\"C:\\Users\\Admin\\AppData\\Roaming\\Yibfzzhfi\\Iwnupa.exe\""	SecuriteInfo.com.Variant.Ursu.725994.7033.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4052 set thread context of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 3348 set thread context of 4912	3348	MSBuild.exe	95

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2228	timeout.exe

Script User-Agent 1 IoCs

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

description	flow	ioc
HTTP User-Agent header	50	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe
4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3348	MSBuild.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 4052 wrote to memory of 3100	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	89
PID 4052 wrote to memory of 3100	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	89
PID 4052 wrote to memory of 3100	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	89
PID 3100 wrote to memory of 2228	3100	cmd.exe	91
PID 3100 wrote to memory of 2228	3100	cmd.exe	91
PID 3100 wrote to memory of 2228	3100	cmd.exe	91
PID 4052 wrote to memory of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 4052 wrote to memory of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 4052 wrote to memory of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 4052 wrote to memory of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 4052 wrote to memory of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 4052 wrote to memory of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 4052 wrote to memory of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 4052 wrote to memory of 3348	4052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	94
PID 3348 wrote to memory of 4912	3348	MSBuild.exe	95
PID 3348 wrote to memory of 4912	3348	MSBuild.exe	95
PID 3348 wrote to memory of 4912	3348	MSBuild.exe	95
PID 3348 wrote to memory of 4912	3348	MSBuild.exe	95
PID 3348 wrote to memory of 4912	3348	MSBuild.exe	95

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Variant.Ursu.725994.7033.exe
"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Variant.Ursu.725994.7033.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4052
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 20
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3100
- - C:\Windows\SysWOW64\timeout.exe
    timeout 20
    3⤵
    - Delays execution with timeout.exe
    PID:2228
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3348
- - 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:4912

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

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

memory/3348-142-0x0000000000400000-0x000000000046D000-memory.dmp

Download

memory/3348-137-0x0000000000400000-0x000000000046D000-memory.dmp

Download

memory/3348-139-0x0000000000400000-0x000000000046D000-memory.dmp

Download

memory/4052-133-0x0000000004B50000-0x0000000004B5A000-memory.dmp

Download

memory/4052-132-0x0000000004AB0000-0x0000000004B42000-memory.dmp

Download

memory/4052-131-0x0000000005160000-0x0000000005704000-memory.dmp

Download

memory/4052-130-0x0000000000210000-0x000000000025E000-memory.dmp

Download

memory/4912-144-0x0000000000800000-0x0000000000866000-memory.dmp

Download

memory/4912-145-0x0000000004F70000-0x000000000500C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads