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Analysis
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max time kernel
141s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
01/01/2025, 22:11
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20241010-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
5722eb2897c6a41e56fcc3173d9adf78
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SHA1
a1fa064390fbe44cf7fb1eef8a4e68f26d4a5ef3
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SHA256
6e32a831742951b814f3826c7377094db7ea20f81508043b946e3e4df6c5b162
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SHA512
5ca756e5079b2a7498c6dba25da3717a467437fee713642dabafa8417040728b0531450a877a736ba3a248c7a6b33e317b7e795e437a5cc81cb6ad9e3a0227a7
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SSDEEP
49152:Kv3I22SsaNYfdPBldt698dBcjHDxM/doGdq1THHB72eh2NT:Kv422SsaNYfdPBldt6+dBcjHDxMVa
Malware Config
Extracted
quasar
1.4.1
first
ZyloX-37288.portmap.host:37288
44382739-6e8e-4a03-b838-6ed9f8f4bf36
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encryption_key
59DD70006F5E5424ACBA442199524AA9815F439E
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install_name
Calculator.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
RtkAudUService86
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subdirectory
Calculator_UWP
Signatures
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Quasar family
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Quasar payload 2 IoCs
resource yara_rule behavioral2/memory/3128-1-0x0000000000BF0000-0x0000000000F14000-memory.dmp family_quasar behavioral2/files/0x000a000000023b9e-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2880 Calculator.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4236 schtasks.exe 5064 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
description pid Process Token: SeDebugPrivilege 3128 Client-built.exe Token: SeDebugPrivilege 2880 Calculator.exe Token: SeDebugPrivilege 4384 Client-built.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 2880 Calculator.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 2880 Calculator.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 3128 wrote to memory of 4236 3128 Client-built.exe 82 PID 3128 wrote to memory of 4236 3128 Client-built.exe 82 PID 3128 wrote to memory of 2880 3128 Client-built.exe 84 PID 3128 wrote to memory of 2880 3128 Client-built.exe 84 PID 2880 wrote to memory of 5064 2880 Calculator.exe 85 PID 2880 wrote to memory of 5064 2880 Calculator.exe 85 -
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\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3128 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "RtkAudUService86" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:4236
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C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe"C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:2880 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "RtkAudUService86" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:5064
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵PID:4568
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4384
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
1KB
MD5baf55b95da4a601229647f25dad12878
SHA1abc16954ebfd213733c4493fc1910164d825cac8
SHA256ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
SHA51224f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545
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Filesize
3.1MB
MD55722eb2897c6a41e56fcc3173d9adf78
SHA1a1fa064390fbe44cf7fb1eef8a4e68f26d4a5ef3
SHA2566e32a831742951b814f3826c7377094db7ea20f81508043b946e3e4df6c5b162
SHA5125ca756e5079b2a7498c6dba25da3717a467437fee713642dabafa8417040728b0531450a877a736ba3a248c7a6b33e317b7e795e437a5cc81cb6ad9e3a0227a7