blustealer | 8908acf28585acbad787f5b1fc7b53b99ca8fb7d03ef05cdb6cd436102fd82cc

General

Target

Dekont.PDF.exe
Size

1.3MB
MD5

8feabe088c948dc8f387c098e6840ed4
SHA1

52522a7e7bae6061fc3b32ec3a25af902f164af8
SHA256

8908acf28585acbad787f5b1fc7b53b99ca8fb7d03ef05cdb6cd436102fd82cc
SHA512

593af500334afd603b4ab82d315362123000a078772a5f1f5dd5eb29aae39606eb87ef96cb9915bb243365c851de54646ffd81eff666b4277144184c008bef01
SSDEEP

24576:br3xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxNussBq5fr+:0qhrk1QmY9OrXS76Fdj

Score

10^/10

blustealer collection stealer

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5310184325:AAFI3fSQ6VcGu_NSTmv7d-qK2WCVhYY_qfg/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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	Dekont.PDF.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\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 4916 set thread context of 5092	4916	Dekont.PDF.exe	95
PID 5092 set thread context of 928	5092	Dekont.PDF.exe	96

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1528	schtasks.exe

Script User-Agent 1 IoCs

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

description	flow	ioc
HTTP User-Agent header	35	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4916	Dekont.PDF.exe
4916	Dekont.PDF.exe
852	powershell.exe
852	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4916	Dekont.PDF.exe
Token: SeDebugPrivilege	852	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5092	Dekont.PDF.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 4916 wrote to memory of 852	4916	Dekont.PDF.exe	91
PID 4916 wrote to memory of 852	4916	Dekont.PDF.exe	91
PID 4916 wrote to memory of 852	4916	Dekont.PDF.exe	91
PID 4916 wrote to memory of 1528	4916	Dekont.PDF.exe	93
PID 4916 wrote to memory of 1528	4916	Dekont.PDF.exe	93
PID 4916 wrote to memory of 1528	4916	Dekont.PDF.exe	93
PID 4916 wrote to memory of 5092	4916	Dekont.PDF.exe	95
PID 4916 wrote to memory of 5092	4916	Dekont.PDF.exe	95
PID 4916 wrote to memory of 5092	4916	Dekont.PDF.exe	95
PID 4916 wrote to memory of 5092	4916	Dekont.PDF.exe	95
PID 4916 wrote to memory of 5092	4916	Dekont.PDF.exe	95
PID 4916 wrote to memory of 5092	4916	Dekont.PDF.exe	95
PID 4916 wrote to memory of 5092	4916	Dekont.PDF.exe	95
PID 4916 wrote to memory of 5092	4916	Dekont.PDF.exe	95
PID 5092 wrote to memory of 928	5092	Dekont.PDF.exe	96
PID 5092 wrote to memory of 928	5092	Dekont.PDF.exe	96
PID 5092 wrote to memory of 928	5092	Dekont.PDF.exe	96
PID 5092 wrote to memory of 928	5092	Dekont.PDF.exe	96
PID 5092 wrote to memory of 928	5092	Dekont.PDF.exe	96

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\Dekont.PDF.exe
"C:\Users\Admin\AppData\Local\Temp\Dekont.PDF.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4916
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\GuYxLKsycrfSBi.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:852
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GuYxLKsycrfSBi" /XML "C:\Users\Admin\AppData\Local\Temp\tmpD8D.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1528
- C:\Users\Admin\AppData\Local\Temp\Dekont.PDF.exe
  "C:\Users\Admin\AppData\Local\Temp\Dekont.PDF.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5092
- - 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:928

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

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

C:\Users\Admin\AppData\Local\Temp\tmpD8D.tmp

Filesize
1KB

MD5
9ef83d5be86dc05966ceb8adf8b16f7a

SHA1
d6bea484192c5fba77797e826d0b031da58872ca

SHA256
95aa45973be63404e641611c1682a8665d7057135d49185bf11ecec76b03cbcf

SHA512
d59aefa9f11cb0def9c7bdc6a4f2ac4997edb976ff5756646798f29f099ed9e5a69bf18fe22cb8fb76477736c9889dfc7d102a222d4dfad686cad745f136658d

Download Submit
memory/852-156-0x0000000007360000-0x00000000079DA000-memory.dmp

Filesize
6.5MB

Download
memory/852-142-0x0000000004B70000-0x0000000005198000-memory.dmp

Filesize
6.2MB

Download
memory/852-151-0x0000000005A00000-0x0000000005A1E000-memory.dmp

Filesize
120KB

Download
memory/852-149-0x0000000005350000-0x00000000053B6000-memory.dmp

Filesize
408KB

Download
memory/852-164-0x0000000007040000-0x0000000007048000-memory.dmp

Filesize
32KB

Download
memory/852-154-0x0000000071080000-0x00000000710CC000-memory.dmp

Filesize
304KB

Download
memory/852-140-0x00000000020E0000-0x0000000002116000-memory.dmp

Filesize
216KB

Download
memory/852-163-0x0000000007060000-0x000000000707A000-memory.dmp

Filesize
104KB

Download
memory/852-155-0x00000000069A0000-0x00000000069BE000-memory.dmp

Filesize
120KB

Download
memory/852-162-0x0000000006F50000-0x0000000006F5E000-memory.dmp

Filesize
56KB

Download
memory/852-161-0x0000000006FA0000-0x0000000007036000-memory.dmp

Filesize
600KB

Download
memory/852-160-0x0000000006D90000-0x0000000006D9A000-memory.dmp

Filesize
40KB

Download
memory/852-148-0x0000000004A50000-0x0000000004A72000-memory.dmp

Filesize
136KB

Download
memory/852-153-0x00000000069C0000-0x00000000069F2000-memory.dmp

Filesize
200KB

Download
memory/852-157-0x0000000006D20000-0x0000000006D3A000-memory.dmp

Filesize
104KB

Download
memory/928-159-0x0000000000F10000-0x0000000000F76000-memory.dmp

Filesize
408KB

Download
memory/4916-133-0x0000000005D80000-0x0000000006324000-memory.dmp

Filesize
5.6MB

Download
memory/4916-132-0x0000000000C10000-0x0000000000D5C000-memory.dmp

Filesize
1.3MB

Download
memory/4916-135-0x00000000058C0000-0x00000000058CA000-memory.dmp

Filesize
40KB

Download
memory/4916-134-0x0000000005710000-0x00000000057A2000-memory.dmp

Filesize
584KB

Download
memory/4916-137-0x000000000C670000-0x000000000C6D6000-memory.dmp

Filesize
408KB

Download
memory/4916-136-0x000000000C390000-0x000000000C42C000-memory.dmp

Filesize
624KB

Download
memory/5092-152-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/5092-165-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/5092-146-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/5092-144-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads