General
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Target
Client-built.exe
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Size
3MB
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Sample
230528-tem7gsfh8w
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MD5
7df4e544bf7658d90be86b4719b32bf1
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SHA1
0fe125b130f8cd829e91c4405a1c20171f7b9e6d
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SHA256
837407f9ad35492f9ee8ed7fdcecdd82fd715d3d60c5cc531d6a9dc43dc21cf4
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SHA512
bc95431e5d58bcf583f7fd3baf2af83bd638b4cec23c3e617b0cdbb111da3fae7e65872e2b48ac4638d9776fd496ede7a6f06da0ebd380c88516e5ae32fbe346
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SSDEEP
49152:rvvI22SsaNYfdPBldt698dBcjHFI6OBxfRoGdzhTHHB72eh2NT:rvg22SsaNYfdPBldt6+dBcjHa64
Malware Config
Extracted
quasar
1.4.1
Office04
57.5034.214.1:4782
7cfe7fd0-8b48-41d0-86ed-0f1f7bc93aa7
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encryption_key
8DC329A0B0D672D54EA380BA2B8C673FA58CCC1A
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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
Targets
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Target
Client-built.exe
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Size
3MB
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MD5
7df4e544bf7658d90be86b4719b32bf1
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SHA1
0fe125b130f8cd829e91c4405a1c20171f7b9e6d
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SHA256
837407f9ad35492f9ee8ed7fdcecdd82fd715d3d60c5cc531d6a9dc43dc21cf4
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SHA512
bc95431e5d58bcf583f7fd3baf2af83bd638b4cec23c3e617b0cdbb111da3fae7e65872e2b48ac4638d9776fd496ede7a6f06da0ebd380c88516e5ae32fbe346
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SSDEEP
49152:rvvI22SsaNYfdPBldt698dBcjHFI6OBxfRoGdzhTHHB72eh2NT:rvg22SsaNYfdPBldt6+dBcjHa64
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Quasar payload
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE
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Legitimate hosting services abused for malware hosting/C2
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Writes to the Master Boot Record (MBR)
Bootkits write to the MBR to gain persistence at a level below the operating system.
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