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

Static analysis result for SHA-256 e03f630df4a3d8cd…

MALICIOUS

Office (OLE) / .XLS

25.5 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 3533fdc6d7a1a9986e40c496aab73b36 SHA-1: bcfb84bef67493835930559aa375fb5945c5e593 SHA-256: e03f630df4a3d8cd868e640dcdad5cfb1b31bd7aa589c4560c9766342d52b8c1
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is a malicious Microsoft Excel file that exploits the CVE-2009-3129 vulnerability. This vulnerability allows for arbitrary code execution when the file is opened. The heuristic firings indicate a PEB access and a suspicious invocation of cmd.exe, suggesting the exploit likely leads to command execution.

Heuristics 3

  • 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.
  • 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

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