blustealer | 068a5a6741c0bf5326cdce7e406c5273340ad1c9f4371fadeb88bf794f1d91e6

Analysis

max time kernel
57s
max time network
58s
platform
windows7_x64
resource
win7-20220414-en
submitted
04/05/2022, 10:38

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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

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

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-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\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-1-5-21-2277218442-1199762539-2004043321-1000\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 1052 set thread context of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 580 set thread context of 700	580	MSBuild.exe	32

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
1172	timeout.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
580	MSBuild.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1052 wrote to memory of 1988	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	28
PID 1052 wrote to memory of 1988	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	28
PID 1052 wrote to memory of 1988	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	28
PID 1052 wrote to memory of 1988	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	28
PID 1988 wrote to memory of 1172	1988	cmd.exe	30
PID 1988 wrote to memory of 1172	1988	cmd.exe	30
PID 1988 wrote to memory of 1172	1988	cmd.exe	30
PID 1988 wrote to memory of 1172	1988	cmd.exe	30
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 1052 wrote to memory of 580	1052	SecuriteInfo.com.Variant.Ursu.725994.7033.exe	31
PID 580 wrote to memory of 700	580	MSBuild.exe	32
PID 580 wrote to memory of 700	580	MSBuild.exe	32
PID 580 wrote to memory of 700	580	MSBuild.exe	32
PID 580 wrote to memory of 700	580	MSBuild.exe	32
PID 580 wrote to memory of 700	580	MSBuild.exe	32
PID 580 wrote to memory of 700	580	MSBuild.exe	32
PID 580 wrote to memory of 700	580	MSBuild.exe	32
PID 580 wrote to memory of 700	580	MSBuild.exe	32
PID 580 wrote to memory of 700	580	MSBuild.exe	32

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\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⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1052
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 20
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1988
- - C:\Windows\SysWOW64\timeout.exe
    timeout 20
    3⤵
    - Delays execution with timeout.exe
    PID:1172
- 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:580
- - 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:700

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

memory/580-72-0x0000000000400000-0x000000000046D000-memory.dmp

Download

memory/580-63-0x0000000000400000-0x000000000046D000-memory.dmp

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memory/580-60-0x0000000000400000-0x000000000046D000-memory.dmp

Download

memory/580-68-0x0000000000400000-0x000000000046D000-memory.dmp

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memory/580-65-0x0000000000400000-0x000000000046D000-memory.dmp

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memory/580-61-0x0000000000400000-0x000000000046D000-memory.dmp

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memory/700-73-0x0000000000090000-0x00000000000F6000-memory.dmp

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memory/700-75-0x0000000000090000-0x00000000000F6000-memory.dmp

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memory/700-78-0x0000000000090000-0x00000000000F6000-memory.dmp

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memory/700-80-0x0000000000090000-0x00000000000F6000-memory.dmp

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memory/700-82-0x0000000000C00000-0x0000000000CBC000-memory.dmp

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memory/1052-55-0x00000000763E1000-0x00000000763E3000-memory.dmp

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memory/1052-59-0x0000000005840000-0x00000000058CA000-memory.dmp

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memory/1052-54-0x0000000000890000-0x00000000008DE000-memory.dmp

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memory/1052-56-0x0000000007FB0000-0x0000000008180000-memory.dmp

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