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

Static analysis result for SHA-256 12f445be3eb360cb…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: 46980a1034c1e50936ed93d06a2a0168 SHA-1: f99b8d7797a6f34376a435e77879d2966facb926 SHA-256: 12f445be3eb360cb621537a9ecc077063399643860a2ee26588b69e1f13b6c84
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: 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 leverage this vulnerability upon opening. No VBA macros were found to be executable, and the document body was unreadable, but the Equation Editor exploit is sufficient to classify this as a malicious document.

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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
29686d9b0165ee61a5ecf50a9715b194cf3450e717460af8498ce4facd0692e4		 ole-package OLE Ole10Native stream: MBD01818DB0/OLe10naTIvE 1771 bytes

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