Behavioral task
behavioral1
Sample
free_windows.exe
Resource
win7-20231215-de
General
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Target
free_windows.exe
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Size
348KB
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MD5
5a6f91985611929d8c9765c249690ce8
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SHA1
bc4eb0b9c045508cc7968fcef8d810a4413bf029
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SHA256
37da85549e4e387812a9d59f25e1172324516641ab884a16da72719c40b49225
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SHA512
73e4fafaa220dc39a7c8c512bac3154c221fbe32308378a0cbd0ab3542a19560fa9c9afc00aecb99781c5e1be7a5edfd4699688d03c59ac96df2c49148b5ae50
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SSDEEP
6144:IjNHXf500MtP8wVwWcbobn8QcG93pt/k88Ki:Kd50cwdhj8QcGZpt/kMi
Malware Config
Extracted
quasar
1.3.0.0
Office04
172.16.40.30:4782
QSR_MUTEX_w2uAciOW1UMmPO4cUV
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encryption_key
pRS09vvOAEzyqRurZobQ
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install_name
svchost.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Microsoft svchost
Signatures
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Quasar family
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Quasar payload 1 IoCs
resource yara_rule sample family_quasar -
Unsigned PE 1 IoCs
Checks for missing Authenticode signature.
resource free_windows.exe
Files
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free_windows.exe.exe windows:4 windows x86 arch:x86
f34d5f2d4577ed6d9ceec516c1f5a744
Headers
DLL Characteristics
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_NO_SEH
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE
File Characteristics
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_32BIT_MACHINE
Imports
mscoree
_CorExeMain
Sections
.text Size: 344KB - Virtual size: 344KB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rsrc Size: 2KB - Virtual size: 2KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.reloc Size: 512B - Virtual size: 12B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ