Office (OOXML) / .XLSX malware analysis — malicious · ab01b00bcb24c63b

MALICIOUS

Office (OOXML) / .XLSX

975.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-22

MD5: 2449abedae5587efcf34409ecd071d9e SHA-1: 121e01b3296bd71216e62aa4492b70eb4be47c0f SHA-256: ab01b00bcb24c63b7d4658857872004deab836fdedbc631359dac5a5ffb012b9

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a malicious Equation Editor exploiting CVE-2017-11882. The Ole10Native stream within this object is anomalous and indicative of a payload. This suggests the document is designed to exploit this vulnerability upon opening, leading to the execution of a secondary malicious payload.

Heuristics 5

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

Embedded OLE object xl/embeddings/bEHIt.GZ contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE

A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY

Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `3933adae9c3c978cd63a1101b9ec8c5e794bc8ce37cdf8955e73d1c3d3b03ab8`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/bEHIt.GZ	991232 bytes
`ooxml_oleobject_00_ole10native_00.bin` `81e067ddc097367276247c37440432d20fb2d41c2344949220bedf73f925b15c`	ole-package	OOXML xl/embeddings/bEHIt.GZ Ole10Native stream: oLE10nAtIVe	980699 bytes
`embedded_office_off00001718.ole` `e3b043167c9345740fd630120acae4d44a0d7a0d0518366de126130b57838038`	embedded-office	Embedded OLE/CFB Office body inside ooxml container at offset 0x1718	992617 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.