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

Static analysis result for SHA-256 4e239a1caa3e0c2b…

MALICIOUS

Office (OLE) / .XLS

560.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-14
MD5: a6063daa647a8e3888cb4544224af097 SHA-1: 1ea3e53014ba6f712831272967858e230cac3004 SHA-256: 4e239a1caa3e0c2b8dc90bff4101f2e7edde4b6ddf382e24ed85248cdd500590
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 a payload further supports this. No VBA macros were found to be executable, and the document body was not parsable, suggesting the exploit is delivered directly via the OLE object.

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 3

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
aebfa3cc9cffd1af88424a4828f90c2a91932c7006bd1640e9ae65f18d99a7e2		 ole-package OLE Ole10Native stream: MBD005D9F4C/Ole10Native 167172 bytes
ole10native_01.bin
09742b8a4a22c7662265bcf743584da1b82ebde73ebb56b2a45975661e6b293c		 ole-package OLE Ole10Native stream: MBD005D9F4E/olE10NaTIVE 1197 bytes

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