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

Static analysis result for SHA-256 49cab690ecc8e3b7…

MALICIOUS

Office (OLE) / .XLS

813.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-28
MD5: 322cb27e49ac815934e41b1068cca886 SHA-1: e26e0e702ac29535abaa356c18fb7dca43bfcff9 SHA-256: 49cab690ecc8e3b73685f7202e6d05975da829e61e32e523fe98005e1dde5462
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The critical heuristic firing for CVE-2017-11882 indicates the file contains a malicious Equation Editor OLE object designed to exploit this known vulnerability. The presence of VBA macros, though reported as not containing executable statements, is common in macro-enabled documents used for initial delivery. The file's structure and the specific exploit targeted suggest it's a dropper or initial access vector.

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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
40c17679fbcd740cd40d7c3aa03917783b70a965e1dd263839d42099656ed770		 ole-package OLE Ole10Native stream: MBD012CC5A6/oLe10NatIVe 1877 bytes

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