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

Static analysis result for SHA-256 38eb4fdb341f514d…

MALICIOUS

Office (OLE) / .XLS

848.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-18
MD5: be9f156c90d5a11c7e8e0056a7b37d1e SHA-1: 0245c7fb5fb4678c8caee3bb877780db9bb37c7d SHA-256: 38eb4fdb341f514d6ccfcb0f2ed21de6d46715b9351943ef5b826ae2c65c605e
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This is further supported by the OLE_EQUATION_EDITOR heuristic. Although VBA macros were present, they contained no executable statements, suggesting the exploit is directly embedded within the OLE object. The file is therefore likely used to deliver a second-stage payload via this exploit.

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
e7b89654f6b33d042131ee78574fffdaea4d13a5eda5efbf2c09a049e86b6c9c		 ole-package OLE Ole10Native stream: MBD00AED568/olE10natiVE 1558 bytes

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