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

Static analysis result for SHA-256 e8ec632b8ca366a2…

MALICIOUS

Office (OLE) / .XLS

395.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-10
MD5: a4b2e8a93b9c20ee6552a446c6ba310a SHA-1: 4524abfca51c1694530d7b9c37d78feb90aa674d SHA-256: e8ec632b8ca366a2878ae251e33b1947b6154a0f972a2d798f0d852f680f7410
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link T1566 Phishing T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample is an Excel file containing a malicious Equation Editor object, which is a known vector for exploiting CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, typically used to download and execute a second-stage payload. No VBA macros were found to be executable, and the document body was not parsable.

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
e71da1c76121c4f2a526a4e2ef94feee1a0215daa7951bcb57e5f9a61776d879		 ole-package OLE Ole10Native stream: MBD01FCC1DD/oLE10natIVe 1809 bytes

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