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

Static analysis result for SHA-256 bb6773f9c32f1279…

MALICIOUS

Office (OLE) / .XLSX

266.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-09
MD5: bde65b168a5c4012dbd6bb9cfd6fd94e SHA-1: f44af9b8074fe0723fec652c5b9fa70ec99ed9c5 SHA-256: bb6773f9c32f1279ca8a2aab10c0ece0ab952e1e42112b20c7ad5f185c23688d
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains a critical heuristic firing for CVE-2017-11882, indicating the exploitation of a vulnerability in the Equation Editor OLE object. This technique is commonly used to execute arbitrary code. No VBA macros were found to be executable, and the document body was unreadable, but the presence of the CVE-2017-11882 exploit is sufficient evidence 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
6416f8b2e63886e59e5cbc2e8c58b78aff6ebb7101b510d07eabc60647effc8a		 ole-package OLE Ole10Native stream: MBD0193C7AC/oLe10NatIVE 1214 bytes

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