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

Static analysis result for SHA-256 a31a2f07410329f1…

MALICIOUS

Office (OLE) / .XLSX

1.91 MB First seen: 2026-05-13
MD5: 7415ea7207377d348bbce2ab2c7de9c7 SHA-1: 2b9c212c06df7b79171212b3d01e85a5e763d829 SHA-256: a31a2f07410329f169978c373a273cb2d181d8dbab4102e55899b59e92ec46f6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017_11882 indicates that the file contains a malicious Equation Editor OLE object. This exploit is known to allow for arbitrary code execution. The embedded artifact 'ole10native_00.bin' is the payload associated with this exploit.

Heuristics 3

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin ole-package OLE Ole10Native stream: oLE10nAtIVe 1983121 bytes
SHA-256: 41b3659e2d34aedfbf3ac9778407e535ee34526d13f21bf2efec37314e9f3c8c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.