Office (OLE) / .XLS malware analysis — malicious · 2cdc39a5abd77b5c

MALICIOUS

Office (OLE) / .XLS

875.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-11

MD5: 1b917243d3fee1f25a674c2c6051b8f9 SHA-1: e1b4f7eabeb6359d161151cf4f8d89e96070acc2 SHA-256: 2cdc39a5abd77b5cef1d295c52ec1dbddca287404e42d1bde811976a5c369562

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1566 Phishing T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The critical heuristic firing indicates the presence of a payload associated with CVE-2017-11882 within an Equation Editor OLE object. This exploit is commonly used to execute arbitrary code, suggesting the file's primary purpose is to leverage this vulnerability for initial compromise. The presence of OLE objects and the specific CVE points to a classic exploit delivery mechanism.

Heuristics 2

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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ole10native_00.bin` `f81b5dc0f134bff67b32850863689811e3ff1dad6ed5cd918403c20cc4d6ab1e`	ole-package	OLE Ole10Native stream: MBD0AE2AA7D/Ole10Native	30803 bytes
`ole10native_08.bin` `e77b484d8658f0d914c52409df617032a3a919659d8b3da021f9e0616e8c64b0`	ole-package	OLE Ole10Native stream: MBD0AE2AA86/olE10natIvE	1395 bytes

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