Xls.Dropper.Agent-1517477 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 829b04fe2362b071…

MALICIOUS

Office (OLE) / .XLS

106.6 KB
MD5: 7d5b0b8274e189d406cc3374f994e441 SHA-1: d17737950a9998011589f9a19dd9a009135307df SHA-256: 829b04fe2362b07185694f08d25e91372d95afc9540df9247b58157a46da4c02
202 Risk Score

Malware Insights

Xls.Dropper.Agent-1517477 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV with the signature Xls.Dropper.Agent-1517477. Static analysis revealed the use of XOR-encoded strings and a reference to the CreateProcess API, indicating the sample's intent to execute a secondary payload. The OLE document structure also shows an unusual amount of slack space, often used to hide malicious code.

Heuristics 5

  • XOR-encoded strings (key 0x88) critical SC_XOR_ENCODED
    Found 8 Windows library/API name(s) XOR-encoded with single-byte key 0x88: 'wininet.dll', 'LoadLibraryA', 'GetProcAddress', 'CreateProcessA', 'CreateFileA', 'InternetOpenA', 'HttpOpenRequestA', 'HttpSendRequestA'
  • ClamAV: Xls.Dropper.Agent-1517477 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-1517477
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 109,184 bytes but its declared streams total only 56,346 bytes — 52,838 bytes (48%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.microsoft.com
    • https://www.verisign.com/rpa
    • http://ocsp.verisign.com/ocsp/status0
    • https://www.verisign.com/rpa0
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0

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