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

Static analysis result for SHA-256 cab38285c8c6852a…

MALICIOUS

Office (OLE) / .XLS

848.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-17
MD5: 3aaa900ba3e1dac0a85590af998723d1 SHA-1: 670b43aa52bddd977dd6c01b9fed191c610bb13e SHA-256: cab38285c8c6852a65bdd3dbf21cd2877f859407c07aab8bb2e7660eb2a87d2a
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing this exploit payload strongly suggests the file is designed to deliver a secondary malicious payload upon opening. No VBA macros were found to be executable, and the document body was unreadable, making the exploit the primary indicator of malicious intent.

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
476cdeae8c36a889c91c56afa5a5ef06e9248fcdf3c2e8b0f8ec48eaacb0f80a		 ole-package OLE Ole10Native stream: MBD00873BF6/Ole10Native 1569 bytes

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