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

Static analysis result for SHA-256 d15c49eccd9b3350…

MALICIOUS

Office (OLE) / .XLS

838.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-22
MD5: 65ae12bff085c0e4bbd6a695be4176fe SHA-1: 654e09f4f4d089f875cb5ddb1d5f990334438f40 SHA-256: d15c49eccd9b3350d538c6332f813ba68d689a133e209df76bab8a10cd3972eb
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.002 Phishing: Spearphishing Attachment

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing this payload strongly suggests the file is designed to execute arbitrary code upon opening. No VBA macros were found to contain executable statements, but the OLE object itself is the primary vector.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
dbb7cb4b065986cee292b50db49f65624f74fba4c5320f32a55b3e8529282f64		 ole-package OLE Ole10Native stream: MBD0223BAD6/olE10NAtIve 1555 bytes

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