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

Static analysis result for SHA-256 7d7a3f3c1c8a312f…

MALICIOUS

Office (OLE) / .XLS

393.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-04
MD5: 1c0478115610edaabad652f4fddca8e1 SHA-1: 78015fdb807e9e966bca8f4037ad28c2a18c6c9f SHA-256: 7d7a3f3c1c8a312f0fdc7ca120bbc9078505a94b522affad38ab9683e57d2ed9
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment

The critical heuristic firing indicates the presence of a CVE-2017-11882 Equation Editor exploit. This vulnerability is commonly used to execute arbitrary code when the document is opened. No VBA macros were found to be executable, and the document body was not parsable, suggesting the exploit is the primary mechanism for payload delivery.

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
8d79343b04d89cdeb5b134c9fb554ef03765dd91f911ebb86bc7a3f160902962		 ole-package OLE Ole10Native stream: MBD003C503B/olE10NATiVE 1675 bytes

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