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

Static analysis result for SHA-256 daf94b249fcd95e6…

MALICIOUS

Office (OLE) / .XLS

209.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-24
MD5: 6c72120cf824b57b685ca003b09138d5 SHA-1: 95a933d9128cafef93bc293b0575e525eb90f833 SHA-256: daf94b249fcd95e695eecea3da52a0678daef8d5cea25b04f3352236817eaed8
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object. Heuristics indicate this object exploits CVE-2017-11882, a known vulnerability allowing for arbitrary code execution. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the Equation Editor exploit itself. The SHA256 hash is included as an IOC.

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
fea60f898f08f85c8cdfeb9e1872b3ba88672ba5527cc2158ddfe6bf7029cb6e		 ole-package OLE Ole10Native stream: MBD002A0E49/ole10natIVE 1803 bytes

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