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

Static analysis result for SHA-256 67b636e506316c91…

MALICIOUS

Office (OLE) / .XLS

204.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-04-03
MD5: 4fb4c8ababf72ddf5d1f0d062bab366b SHA-1: 87d9502a787ead76800eccecba7e50a8bb84876f SHA-256: 67b636e506316c91b7dac8f11a003b70e68a981fbaef6bb44e640eb671d5bac9
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains an embedded OLE object exploiting CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the Equation Editor 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
ab524830595105db590c246bd4abace09c1c22e64e4ff9d8ba92e01d457ce509		 ole-package OLE Ole10Native stream: MBD02494B1B/olE10nATIVE 1302 bytes

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