blustealer | 3cca31e08e5e7460380b7547f77a67485cb559c5b1982894c7e739031be97920

General

Target

Halkbank,doc.exe
Size

944KB
MD5

895140d717ad9ea92e1fdf27d9a8faab
SHA1

1915a1c454d26d827e72c1f2edd242e66261f495
SHA256

3cca31e08e5e7460380b7547f77a67485cb559c5b1982894c7e739031be97920
SHA512

242214e9b8dcb1e70cc7797c3670e44a49084289cc684131b856e3b0f9995b47ff84e64c5a9d4453aede376ee06b3d33573e4e3d3f7cde5a3ff3668e9483c2ca
SSDEEP

12288:MFzTTDV7uikFgUWYaM47dS7gWe8JX70AJ4LcGWmZVLFzNEMMYzJI0xks:MF/TDlubgUOl7dS7gowpr9XxZBJJx

Score

10^/10

blustealer stormkitty collection stealer

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5468731092:AAGGNQWBVRhX622u6xp1moMhaunIGtXuIxg/sendMessage?chat_id=1639214896

Signatures

BluStealer
A Modular information stealer written in Visual Basic.
stealer blustealer
StormKitty
StormKitty is an open source info stealer written in C#.
stealer stormkitty

StormKitty payload 4 IoCs

resource	yara_rule
behavioral1/memory/944-74-0x0000000000090000-0x00000000000AA000-memory.dmp	family_stormkitty
behavioral1/memory/944-75-0x00000000000A4F6E-mapping.dmp	family_stormkitty
behavioral1/memory/944-77-0x0000000000090000-0x00000000000AA000-memory.dmp	family_stormkitty
behavioral1/memory/944-79-0x0000000000090000-0x00000000000AA000-memory.dmp	family_stormkitty

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	icanhazip.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1476 set thread context of 1328	1476	Halkbank,doc.exe	27
PID 1328 set thread context of 944	1328	Halkbank,doc.exe	28

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	AppLaunch.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	AppLaunch.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1476	Halkbank,doc.exe
1476	Halkbank,doc.exe
1476	Halkbank,doc.exe
1476	Halkbank,doc.exe
1476	Halkbank,doc.exe
1476	Halkbank,doc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1476	Halkbank,doc.exe
Token: SeDebugPrivilege	944	AppLaunch.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1476	Halkbank,doc.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1476	Halkbank,doc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1328	Halkbank,doc.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1476 wrote to memory of 1328	1476	Halkbank,doc.exe	27
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28
PID 1328 wrote to memory of 944	1328	Halkbank,doc.exe	28

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe
"C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1476
- C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe
  "C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1328
- - 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
    - Checks processor information in registry
    - Suspicious use of AdjustPrivilegeToken
    - outlook_office_path
    - outlook_win_path
    PID:944

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

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

Replay Monitor

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Downloads

memory/944-72-0x0000000000090000-0x00000000000AA000-memory.dmp

Filesize
104KB

Download
memory/944-79-0x0000000000090000-0x00000000000AA000-memory.dmp

Filesize
104KB

Download
memory/944-77-0x0000000000090000-0x00000000000AA000-memory.dmp

Filesize
104KB

Download
memory/944-74-0x0000000000090000-0x00000000000AA000-memory.dmp

Filesize
104KB

Download
memory/1328-63-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/1328-81-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/1328-61-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/1328-82-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/1328-65-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/1328-68-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/1328-60-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/1476-59-0x0000000000EB0000-0x0000000000ED8000-memory.dmp

Filesize
160KB

Download
memory/1476-57-0x0000000000B90000-0x0000000000B9C000-memory.dmp

Filesize
48KB

Download
memory/1476-56-0x0000000000B80000-0x0000000000B96000-memory.dmp

Filesize
88KB

Download
memory/1476-55-0x0000000075E51000-0x0000000075E53000-memory.dmp

Filesize
8KB

Download
memory/1476-58-0x0000000007F20000-0x0000000007F9E000-memory.dmp

Filesize
504KB

Download
memory/1476-54-0x0000000000F10000-0x0000000001002000-memory.dmp

Filesize
968KB

Download

Analysis

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