blustealer | 85d3d548fea1f4e1a1580a310ec2e0bcafaed400134feb76a0f6d25afb4f8628

General

Target

SALARY RECEIPT.exe
Size

3.3MB
MD5

bc9e97f5f18b18824f0d7d4b57603f8d
SHA1

a4f93b7a36b7584fe7ef3bc8e5f5e171a57933d5
SHA256

ed9b8b2727090a9a786fd014f3716eda74f0943e02c215c04c07613c3f271de9
SHA512

5a8bbf32d1a7f3301133c0466b7af051fa6c9c92d33cab5636a3788aa703eb998f0992c89125f0978c2ced43992ad46bd9d6346557ccb8189c74b024ceeb2204
SSDEEP

49152:3YlX8PHUEni17exKgyLiTJVr3SEUnbMXS+q3C:3YlX8P

Score

10^/10

blustealer collection persistence spyware stealer

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5813496253:AAF4hamIx4-mNmFF1DwsqdJ4F9vUBmFqLo/sendMessage?chat_id=1105271645

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-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation	SALARY RECEIPT.exe

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

Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

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-1-5-21-1675742406-747946869-1029867430-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Aagaxjzofi = "\"C:\\Users\\Admin\\AppData\\Roaming\\Stetfasle\\Aagaxjzofi.exe\""	SALARY RECEIPT.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3408 set thread context of 780	3408	SALARY RECEIPT.exe	94
PID 780 set thread context of 4632	780	SALARY RECEIPT.exe	96

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

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4304	powershell.exe
4304	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4304	powershell.exe
Token: SeDebugPrivilege	3408	SALARY RECEIPT.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
780	SALARY RECEIPT.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3408 wrote to memory of 4304	3408	SALARY RECEIPT.exe	86
PID 3408 wrote to memory of 4304	3408	SALARY RECEIPT.exe	86
PID 3408 wrote to memory of 4304	3408	SALARY RECEIPT.exe	86
PID 3408 wrote to memory of 780	3408	SALARY RECEIPT.exe	94
PID 3408 wrote to memory of 780	3408	SALARY RECEIPT.exe	94
PID 3408 wrote to memory of 780	3408	SALARY RECEIPT.exe	94
PID 3408 wrote to memory of 780	3408	SALARY RECEIPT.exe	94
PID 3408 wrote to memory of 780	3408	SALARY RECEIPT.exe	94
PID 3408 wrote to memory of 780	3408	SALARY RECEIPT.exe	94
PID 3408 wrote to memory of 780	3408	SALARY RECEIPT.exe	94
PID 3408 wrote to memory of 780	3408	SALARY RECEIPT.exe	94
PID 780 wrote to memory of 4632	780	SALARY RECEIPT.exe	96
PID 780 wrote to memory of 4632	780	SALARY RECEIPT.exe	96
PID 780 wrote to memory of 4632	780	SALARY RECEIPT.exe	96
PID 780 wrote to memory of 4632	780	SALARY RECEIPT.exe	96
PID 780 wrote to memory of 4632	780	SALARY RECEIPT.exe	96

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\SALARY RECEIPT.exe
"C:\Users\Admin\AppData\Local\Temp\SALARY RECEIPT.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3408
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4304
- C:\Users\Admin\AppData\Local\Temp\SALARY RECEIPT.exe
  "C:\Users\Admin\AppData\Local\Temp\SALARY RECEIPT.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:780
- - 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:4632

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

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_c4hxv1kk.mso.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/780-163-0x0000000000400000-0x0000000000472000-memory.dmp

Filesize
456KB

Download
memory/780-173-0x0000000000400000-0x0000000000472000-memory.dmp

Filesize
456KB

Download
memory/780-169-0x0000000000400000-0x0000000000472000-memory.dmp

Filesize
456KB

Download
memory/780-166-0x0000000000400000-0x0000000000472000-memory.dmp

Filesize
456KB

Download
memory/3408-133-0x0000000000440000-0x000000000079C000-memory.dmp

Filesize
3.4MB

Download
memory/3408-134-0x00000000052E0000-0x00000000052F0000-memory.dmp

Filesize
64KB

Download
memory/3408-135-0x0000000005520000-0x0000000005542000-memory.dmp

Filesize
136KB

Download
memory/3408-155-0x00000000052E0000-0x00000000052F0000-memory.dmp

Filesize
64KB

Download
memory/4304-144-0x00000000061A0000-0x0000000006206000-memory.dmp

Filesize
408KB

Download
memory/4304-157-0x0000000003200000-0x0000000003210000-memory.dmp

Filesize
64KB

Download
memory/4304-136-0x0000000005250000-0x0000000005286000-memory.dmp

Filesize
216KB

Download
memory/4304-150-0x0000000003200000-0x0000000003210000-memory.dmp

Filesize
64KB

Download
memory/4304-151-0x00000000067C0000-0x00000000067DE000-memory.dmp

Filesize
120KB

Download
memory/4304-149-0x0000000003200000-0x0000000003210000-memory.dmp

Filesize
64KB

Download
memory/4304-156-0x0000000003200000-0x0000000003210000-memory.dmp

Filesize
64KB

Download
memory/4304-154-0x0000000003200000-0x0000000003210000-memory.dmp

Filesize
64KB

Download
memory/4304-158-0x0000000003200000-0x0000000003210000-memory.dmp

Filesize
64KB

Download
memory/4304-138-0x00000000060C0000-0x0000000006126000-memory.dmp

Filesize
408KB

Download
memory/4304-137-0x00000000058C0000-0x0000000005EE8000-memory.dmp

Filesize
6.2MB

Download
memory/4304-152-0x0000000008050000-0x00000000086CA000-memory.dmp

Filesize
6.5MB

Download
memory/4304-153-0x0000000006CC0000-0x0000000006CDA000-memory.dmp

Filesize
104KB

Download
memory/4632-171-0x0000000005550000-0x00000000055EC000-memory.dmp

Filesize
624KB

Download
memory/4632-170-0x0000000000E00000-0x0000000000E66000-memory.dmp

Filesize
408KB

Download

Analysis

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