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

Static analysis result for SHA-256 5d5dd7f8995be136…

MALICIOUS

Office (OLE) / .XLS

512.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-15
MD5: 5e674c440f2ce73ce1749c4b750beb8a SHA-1: 759278c8f993238a910d044c639d57966174a71f SHA-256: 5d5dd7f8995be136e071be3f10063161a56d6d1e21dbde87511997001afbf9db
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link T1566 Phishing T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel file containing a malicious Equation Editor OLE object. This object exploits the CVE-2017-11882 vulnerability, which is known to deliver a second-stage payload. No VBA macros were found to be executable, and the document body was unreadable, indicating the exploit is the primary attack vector. The presence of the Equation Editor OLE object strongly suggests exploitation of CVE-2017-11882.

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
9bb369a966d36d5ce09aa16c9276daa34d31fd26a4cb0e805443f72276bd825d		 ole-package OLE Ole10Native stream: MBD019AB20B/oLE10nATIve 2033 bytes

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