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

Static analysis result for SHA-256 977353820527e746…

MALICIOUS

Office (OLE) / .XLS

848.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-17
MD5: 5dc9c4cda4db8ef0a97fe4bc5673ab40 SHA-1: b0a13651f1e8dbc67efb1649d1f9de465552aac1 SHA-256: 977353820527e74634e139a26f5716b2b4c5be0bd5c9f73b7f2f799b8d66aa46
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in the Equation Editor component of Microsoft Office. While the VBA macros themselves contain no executable statements, the presence of the Equation Editor OLE object strongly suggests this vulnerability is being leveraged for initial execution. The file's structure and the specific heuristic point to a classic exploit delivery mechanism.

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
1d5e35dc46f41e029288842946d679d83add92fdbc33b53163aa2b92adff3bc9		 ole-package OLE Ole10Native stream: MBD00925320/Ole10Native 1522 bytes

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