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

Static analysis result for SHA-256 36bfe471de8765f1…

MALICIOUS

Office (OLE) / .XLS

683.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-06
MD5: e7fd9fc17216ee5b41867a90b6514813 SHA-1: a91392847605ea2dd4cabbb0b18c8a4689517798 SHA-256: 36bfe471de8765f11de3ca3fce2a6a9b36d47ad8de09cc79b6648f09a653fd88
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 via the Equation Editor OLE object. The document body, formatted as a purchase order, serves as a lure to entice the user to open the malicious object. No VBA macros were found to contain executable statements, suggesting the primary attack vector is the embedded OLE object.

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
382fc1344a2f0cf6eda18645d41def8d571debc6637bc7fe02a5c83715a51bef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2112 bytes
ole10native_00.bin
d5df5ce62dccc56edde6a317b2a623891cdaa5db39974209ccbac924f70aaf12		 ole-package OLE Ole10Native stream: MBD0105BBAF/oLE10naTIVE 1570 bytes

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