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

Static analysis result for SHA-256 4c47a7ad8c1b6fc9…

MALICIOUS

Office (OLE) / .XLS

569.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-15
MD5: 9845cf81d2dfbc1bb556cf2d9292ae0c SHA-1: 1cba5cd0222835e5d9b0db58c48e8be9b0ee7028 SHA-256: 4c47a7ad8c1b6fc9ed20e3f8f5edf4e143026e8335e56bb6fd6ef234a4613140
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 sample is a Microsoft Excel file containing a malicious OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability is known to be used to execute arbitrary code, likely to download and run a second-stage payload. No VBA macros were found to be executable, and the document body was unreadable, but the critical heuristic firing strongly indicates exploitation.

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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
49ac0d29027c49031bf0e1e6bb6e9cdcb79422328fa22fa74a2c5f0c6cddc81e		 ole-package OLE Ole10Native stream: MBD01A2CE3D/oLe10naTiVE 1511 bytes

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