blustealer | 9828b2d75984a20ebee6ace8fca7c3b20f52f2102cea4796620f2e0e29ecb293

General

Target

8b43fb960fbec0fcdc81a4e12892204c6dc80156258e92995f2a7ece5da3c5b3.exe
Size

597KB
MD5

1a496bebdf47aaee63127ad8e0f2c038
SHA1

0b4c18d15e7e03fdc58f942236591d01db2a0e15
SHA256

8b43fb960fbec0fcdc81a4e12892204c6dc80156258e92995f2a7ece5da3c5b3
SHA512

534c1b75d3d581ca07c831ddec2639559f63a4f532b8fa97126f23cbf49dc5b58184a7f0027182b8aed3cb4c028ed334860f15164aa092656289435d3e9acb6d
SSDEEP

12288:/Ytho+cYQo+uRRAkbIWsRQ219z0EnDWg9/YG6B5ZdZOkiM:/Yt4YQoRqkV2Eg9h6JdV

Score

10^/10

blustealer collection stealer

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5797428905:AAGaRRXGZN1d9GGFd3sE5x4uSpCGF0PU4m4/sendMessage?chat_id=1251788325

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
4328	euhbi.exe
1740	euhbi.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\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 4328 set thread context of 1740	4328	euhbi.exe	84
PID 1740 set thread context of 4460	1740	euhbi.exe	85

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

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4328	euhbi.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1740	euhbi.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4868 wrote to memory of 4328	4868	8b43fb960fbec0fcdc81a4e12892204c6dc80156258e92995f2a7ece5da3c5b3.exe	82
PID 4868 wrote to memory of 4328	4868	8b43fb960fbec0fcdc81a4e12892204c6dc80156258e92995f2a7ece5da3c5b3.exe	82
PID 4868 wrote to memory of 4328	4868	8b43fb960fbec0fcdc81a4e12892204c6dc80156258e92995f2a7ece5da3c5b3.exe	82
PID 4328 wrote to memory of 1740	4328	euhbi.exe	84
PID 4328 wrote to memory of 1740	4328	euhbi.exe	84
PID 4328 wrote to memory of 1740	4328	euhbi.exe	84
PID 4328 wrote to memory of 1740	4328	euhbi.exe	84
PID 1740 wrote to memory of 4460	1740	euhbi.exe	85
PID 1740 wrote to memory of 4460	1740	euhbi.exe	85
PID 1740 wrote to memory of 4460	1740	euhbi.exe	85
PID 1740 wrote to memory of 4460	1740	euhbi.exe	85
PID 1740 wrote to memory of 4460	1740	euhbi.exe	85

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\8b43fb960fbec0fcdc81a4e12892204c6dc80156258e92995f2a7ece5da3c5b3.exe
"C:\Users\Admin\AppData\Local\Temp\8b43fb960fbec0fcdc81a4e12892204c6dc80156258e92995f2a7ece5da3c5b3.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4868
- C:\Users\Admin\AppData\Local\Temp\euhbi.exe
  "C:\Users\Admin\AppData\Local\Temp\euhbi.exe" C:\Users\Admin\AppData\Local\Temp\fvrclwc.l
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:4328
- - C:\Users\Admin\AppData\Local\Temp\euhbi.exe
    "C:\Users\Admin\AppData\Local\Temp\euhbi.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1740
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
      4⤵
      Accesses Microsoft Outlook profiles
      outlook_office_path
      outlook_win_path
      PID:4460

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

C:\Users\Admin\AppData\Local\Temp\euhbi.exe

Filesize
297KB

MD5
c936b4f432c1b9814d77d8717758db4a

SHA1
ad63ad2a3a5fa271121c9345b31075128ef395fd

SHA256
690e07388b7f6aff8f276c7c44001a5aea4cae4c7918619b7a759d8fd25fc169

SHA512
490fd2aa529ccdccde2c476e7dd4aaae601a19d32740795c28cffff029d2d4fb7454ed94c154dfebbb76aad38949dee49e1cdb4148cbbc331238b2a7e83dfc34

Download Submit
C:\Users\Admin\AppData\Local\Temp\euhbi.exe

Filesize
297KB

MD5
c936b4f432c1b9814d77d8717758db4a

SHA1
ad63ad2a3a5fa271121c9345b31075128ef395fd

SHA256
690e07388b7f6aff8f276c7c44001a5aea4cae4c7918619b7a759d8fd25fc169

SHA512
490fd2aa529ccdccde2c476e7dd4aaae601a19d32740795c28cffff029d2d4fb7454ed94c154dfebbb76aad38949dee49e1cdb4148cbbc331238b2a7e83dfc34

Download Submit
C:\Users\Admin\AppData\Local\Temp\euhbi.exe

Filesize
297KB

MD5
c936b4f432c1b9814d77d8717758db4a

SHA1
ad63ad2a3a5fa271121c9345b31075128ef395fd

SHA256
690e07388b7f6aff8f276c7c44001a5aea4cae4c7918619b7a759d8fd25fc169

SHA512
490fd2aa529ccdccde2c476e7dd4aaae601a19d32740795c28cffff029d2d4fb7454ed94c154dfebbb76aad38949dee49e1cdb4148cbbc331238b2a7e83dfc34

Download Submit
C:\Users\Admin\AppData\Local\Temp\fvrclwc.l

Filesize
5KB

MD5
f3abfac467d7df3fe80d9244f4a3792f

SHA1
ad15978267e72f579cf5dbba1c61f739f929228d

SHA256
b57f33a6d276b635dafcf1164f62f45542e5d14bc68b11cd3cb01cd4f463b5f5

SHA512
97b1243f5b10abb8e9123baaa798362761902f48ed920b1469a8679cf746240899459bc4fd2dfd3c61a208e366ea4bf12f8f734b1c38e583429abefddb8ec6bb

Download Submit
C:\Users\Admin\AppData\Local\Temp\olntt.qha

Filesize
460KB

MD5
cbbfb2f927b0fabeb1307dad8c24cbe3

SHA1
6292ff8cd7b8fce506e851f2e0571013b1bc032b

SHA256
3733fc350665f2e65be9832630829fd62950558c4eb0f6193be5a8718d7e523d

SHA512
997f9f342a14302717ec74ce97fbac60e7c2371641ccad5698dd1540df537ce35d07330d4daf1c17c7dcf8df4803dfa89f0f3277b1760df28fdfdbaba187536d

Download Submit
memory/1740-163-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-169-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-145-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-149-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-175-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-174-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-153-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-173-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-164-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-165-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-166-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-167-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-168-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-142-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-170-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-171-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/1740-172-0x0000000000400000-0x000000000046E000-memory.dmp

Filesize
440KB

Download
memory/4328-140-0x00000000004A0000-0x00000000004A2000-memory.dmp

Filesize
8KB

Download
memory/4460-151-0x00000000054E0000-0x000000000557C000-memory.dmp

Filesize
624KB

Download
memory/4460-150-0x0000000000980000-0x00000000009E6000-memory.dmp

Filesize
408KB

Download

Analysis

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