Analysis
- max time kernel
149s - max time network
147s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
13/05/2026, 19:49
General
- Target v5fueei.exe
- Size 2.6MB
- Sample260513-yjpy4aew2s
- SHA256 f5f0e52163104f81b6897b23284e625d9ddcab36751c1552b64a73004f824cf2
Malware Config
Extracted
-
quasar
-
1.6.6
-
Office04
-
16.16.126.52:6385
-
31757616-807a-40f9-b0a3-7062b1df8d7f
-
encryption_key
7799F230382DEC15CFC54F1D560B5A8B875621D2
-
install_name
Runtime Broker.exe
-
key_salt
5a23f8394640cb9e40658446a04c0bbae82dc93d0470e1b2a406a90fd2520382
-
log_directory
logs
-
reconnect_delay
3000
-
startup_key
RuntimeBroker
-
subdirectory
system32
Signatures
- Family: Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: AddClipboardFormatListener 1 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 5 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\v5fueei.exe"C:\Users\Admin\AppData\Local\Temp\v5fueei.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\system32\Runtime Broker.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
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C:\Users\Admin\AppData\Roaming\system32\Runtime Broker.exe"C:\Users\Admin\AppData\Roaming\system32\Runtime Broker.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\system32\Runtime Broker.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
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C:\Windows\SYSTEM32\cmd.exe"cmd" /K CHCP 4373⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\chcp.comCHCP 4374⤵
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Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Runtime Broker.exe
memory/1684-15-0x000002177C1E0000-0x000002177C22E000-memory.dmp
memory/1684-20-0x000002177C270000-0x000002177C29A000-memory.dmp
memory/1684-27-0x000002177B2B0000-0x000002177B2C0000-memory.dmp
memory/1684-9-0x000002177B2B0000-0x000002177B2C0000-memory.dmp
memory/1684-10-0x0000021778FE0000-0x0000021778FF2000-memory.dmp
memory/1684-11-0x000002177A9A0000-0x000002177A9DA000-memory.dmp
memory/1684-12-0x000002177C190000-0x000002177C1E0000-memory.dmp
memory/1684-13-0x000002177C2A0000-0x000002177C352000-memory.dmp
memory/1684-26-0x000002177C9F0000-0x000002177C9F8000-memory.dmp
memory/1684-25-0x000002177C990000-0x000002177C99A000-memory.dmp
memory/1684-18-0x000002177C360000-0x000002177C3AC000-memory.dmp
memory/1684-17-0x000002177C230000-0x000002177C264000-memory.dmp
memory/1684-16-0x000002177A850000-0x000002177A876000-memory.dmp
memory/1684-14-0x000002177C140000-0x000002177C18A000-memory.dmp
memory/1684-19-0x000002177C3B0000-0x000002177C3FA000-memory.dmp
memory/1684-23-0x000002177C9B0000-0x000002177C9C2000-memory.dmp
memory/1684-24-0x000002177CA10000-0x000002177CA4C000-memory.dmp
memory/1744-2-0x0000028B06B80000-0x0000028B06B9E000-memory.dmp
memory/1744-0-0x0000028B064A0000-0x0000028B0673E000-memory.dmp
memory/1744-1-0x0000028B06BE0000-0x0000028B06BF0000-memory.dmp