Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 5bba8326b5ec1744…

MALICIOUS

Office (OLE) / .XLS

186.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: ce3405f9a940d8bbc26a2d121e31fbcd SHA-1: bb971e3c49789a961a1ccefaae4f6962544ef8e6 SHA-256: 5bba8326b5ec17441af736fccb3d19b77a55e950022a05e8c69784c4ff2a02eb
262 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical CVE-2009-3129 heuristic indicates exploitation of a Microsoft Excel vulnerability. High severity heuristics for NOP sleds, PEB access, and suspicious cmd.exe invocation suggest the execution of malicious code. The presence of an appended executable payload further supports this, likely leading to the download and execution of a second-stage payload via cmd.exe, potentially involving PowerShell.

Heuristics 7

  • CVE-2009-3129 — Excel FEATHEADER record overflow critical CVE exact CVE_2009_3129
    Workbook BIFF stream contains a FEATHEADER (Feature Header) record with anomalous size (record_size=22, isf=4, cbHdrData=4). Legitimate FEATHEADER records are tiny (<100 bytes) and carry cbHdrData values that fit in the record body; the value here is the documented CVE-2009-3129 exploit primitive — cbHdrData drives a memcpy with attacker-controlled size, leading to memory corruption and code execution in Excel 2007/2003.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 191,038 bytes but its declared streams total only 24,565 bytes — 166,473 bytes (87%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • 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.pdf-repair.com
    • http://www.pdf-repair.com)/Producer(Advanced
    • http://www.pdf-repair.com)/ModDate(D:20100406171120+08
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

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