Analysis
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max time kernel
150s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20231127-en -
resource tags
arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system -
submitted
08-12-2023 20:52
Behavioral task
behavioral1
Sample
tmp.exe
Resource
win7-20231023-en
General
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Target
tmp.exe
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Size
3.1MB
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MD5
e606a8d90dc0458e72508b428e950038
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SHA1
5ca61eaf0e2d26e1cf70ff2da183440fe2792081
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SHA256
1fea532c75a33209f094f835261b4f579613a7b2ece7f046a11309d34537f8d5
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SHA512
e0b0a4c33f9256415802beed59913b3db9b02b146eebd9f599abfd2099dc5a4695e2163c6b5a481ff6f52e68173463347b4cd2e5e238a01f75c0c06a79c04dc4
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SSDEEP
49152:evlt62XlaSFNWPjljiFa2RoUYItiRJ6CbR3LoGdWTHHB72eh2NT:evX62XlaSFNWPjljiFXRoUYItiRJ68
Malware Config
Extracted
quasar
1.4.1
Office04
41.216.183.22:4782
73d47cb4-df1b-4a92-9966-ab4a6e59fac1
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encryption_key
9BB10B12B951D4020613CEC9F1D40DD2EE861BD7
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install_name
Office365.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Office365
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subdirectory
SubDir
Signatures
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Quasar payload 1 IoCs
resource yara_rule behavioral2/memory/2028-0-0x0000000000D90000-0x00000000010B4000-memory.dmp family_quasar -
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 1904 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 2028 tmp.exe -
Suspicious use of WriteProcessMemory 2 IoCs
description pid Process procid_target PID 2028 wrote to memory of 1904 2028 tmp.exe 89 PID 2028 wrote to memory of 1904 2028 tmp.exe 89 -
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\tmp.exe"C:\Users\Admin\AppData\Local\Temp\tmp.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2028 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Office365" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Office365.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:1904
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