Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
Client-built.exe
Resource
win10v2004-20240802-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
4491c19e8e05a77c1bab066d1dc5f9de
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SHA1
2a97023553c5cbb81f52ffc96bef00c91ae64f4a
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SHA256
42a05b97773c7321951cb85028ece520e3a34c269cf30111aa996779adf3bccc
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SHA512
353440ddd1645f670e3cb9aa7b3febadf9fb88a35f1a1500fa20e90cb5c63bed70a056f039e9f13b06f4b0e23544a58b9b50bf76ca2acf95b3ca8cdcf05203cc
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SSDEEP
49152:ef58Pfc/PUO2hQgAYUu55TvH22EwHYtbxQCHHBX2ehJNTu:ef58PfsPUBugAHu55TP22Ew4
Malware Config
Extracted
quasar
1.4.1
Office04
still-firefly-10028.pktriot.net:22288
0d77e6bf-daed-41e5-ad1a-4a4f9650e9d5
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encryption_key
C75C8F2E12DF23FF67198A31653AD36D88F51551
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install_name
COM Surrogate.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
COM Surrogate
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subdirectory
Windows
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 Client-built.exe
Files
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Client-built.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: 3.1MB - Virtual size: 3.1MB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rsrc Size: 3KB - 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