blustealer | 08aa117c4795f93fdbee891121a2cd5e3adc46d9528967ec63ab325243fc7de2

General

Target

Wssimt.exe
Size

21KB
MD5

fbc7a87a40a4f8b9ebc461f02b62a2f7
SHA1

e9311cd1e01e75eee53867c23ab3feb9ab9185ad
SHA256

08aa117c4795f93fdbee891121a2cd5e3adc46d9528967ec63ab325243fc7de2
SHA512

05c3a41e76d5dad9dd43e52f49cd218dd027364ef905607eef8e12664488af5ae648a51d9c476962541ac1c91191d184db7bcca0725e7298ede4cfb1df28095d
SSDEEP

192:yjjfdiDqXanIXkKQUngD33jI1MBSAitI6TxBQ:6daq4PUngpFoTn

Score

10^/10

blustealer stormkitty collection persistence stealer

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5583812995:AAFKzjSLC2-pDvMQ8X47-80XjrRiWrDtxA/sendMessage?chat_id=5434600361

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 1 IoCs

resource	yara_rule
behavioral2/memory/1088-151-0x0000000000E00000-0x0000000000E1A000-memory.dmp	family_stormkitty

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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	Wssimt.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\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-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Thvbp = "\"C:\\Users\\Admin\\AppData\\Roaming\\Vczrecoglj\\Thvbp.exe\""	Wssimt.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
19	icanhazip.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 484 set thread context of 2944	484	Wssimt.exe	91
PID 2944 set thread context of 1088	2944	Wssimt.exe	92

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

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3492	powershell.exe
3492	powershell.exe
484	Wssimt.exe
484	Wssimt.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	484	Wssimt.exe
Token: SeDebugPrivilege	3492	powershell.exe
Token: SeDebugPrivilege	1088	AppLaunch.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2944	Wssimt.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 484 wrote to memory of 3492	484	Wssimt.exe	79
PID 484 wrote to memory of 3492	484	Wssimt.exe	79
PID 484 wrote to memory of 3492	484	Wssimt.exe	79
PID 484 wrote to memory of 4972	484	Wssimt.exe	90
PID 484 wrote to memory of 4972	484	Wssimt.exe	90
PID 484 wrote to memory of 4972	484	Wssimt.exe	90
PID 484 wrote to memory of 2944	484	Wssimt.exe	91
PID 484 wrote to memory of 2944	484	Wssimt.exe	91
PID 484 wrote to memory of 2944	484	Wssimt.exe	91
PID 484 wrote to memory of 2944	484	Wssimt.exe	91
PID 484 wrote to memory of 2944	484	Wssimt.exe	91
PID 484 wrote to memory of 2944	484	Wssimt.exe	91
PID 484 wrote to memory of 2944	484	Wssimt.exe	91
PID 484 wrote to memory of 2944	484	Wssimt.exe	91
PID 2944 wrote to memory of 1088	2944	Wssimt.exe	92
PID 2944 wrote to memory of 1088	2944	Wssimt.exe	92
PID 2944 wrote to memory of 1088	2944	Wssimt.exe	92
PID 2944 wrote to memory of 1088	2944	Wssimt.exe	92
PID 2944 wrote to memory of 1088	2944	Wssimt.exe	92

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\Wssimt.exe
"C:\Users\Admin\AppData\Local\Temp\Wssimt.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:484
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -enc UwB0AGEAcgB0AC0AUwBsAGUAZQBwACAALQBTAGUAYwBvAG4AZABzACAAMQAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3492
- C:\Users\Admin\AppData\Local\Temp\Wssimt.exe
  C:\Users\Admin\AppData\Local\Temp\Wssimt.exe
  2⤵
  PID:4972
- C:\Users\Admin\AppData\Local\Temp\Wssimt.exe
  C:\Users\Admin\AppData\Local\Temp\Wssimt.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2944
- - 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:1088

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

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

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Downloads

memory/484-133-0x00000000055F0000-0x0000000005612000-memory.dmp

Filesize
136KB

Download
memory/484-132-0x00000000000A0000-0x00000000000AC000-memory.dmp

Filesize
48KB

Download
memory/1088-152-0x0000000005AD0000-0x0000000005B6C000-memory.dmp

Filesize
624KB

Download
memory/1088-151-0x0000000000E00000-0x0000000000E1A000-memory.dmp

Filesize
104KB

Download
memory/2944-153-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/2944-149-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/2944-146-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/2944-144-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/3492-136-0x0000000005770000-0x0000000005D98000-memory.dmp

Filesize
6.2MB

Download
memory/3492-141-0x0000000006980000-0x000000000699A000-memory.dmp

Filesize
104KB

Download
memory/3492-140-0x0000000007CB0000-0x000000000832A000-memory.dmp

Filesize
6.5MB

Download
memory/3492-139-0x0000000006480000-0x000000000649E000-memory.dmp

Filesize
120KB

Download
memory/3492-138-0x0000000005E50000-0x0000000005EB6000-memory.dmp

Filesize
408KB

Download
memory/3492-137-0x0000000005650000-0x00000000056B6000-memory.dmp

Filesize
408KB

Download
memory/3492-135-0x0000000002B30000-0x0000000002B66000-memory.dmp

Filesize
216KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads