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

Static analysis result for SHA-256 e46e870d56f6fbc2…

MALICIOUS

Office (OLE) / .XLS

90.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-19
MD5: 591c1829ab3c28ef88f0da4e262a63d7 SHA-1: 82fcbf0d0f65737fa996a895e7d23e33f0eff484 SHA-256: e46e870d56f6fbc286237fce0d5d8536716321a0692e94b0f91499b041c3c66c
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. Although the VBA project itself contains no executable statements, the presence of the vulnerable OLE object is sufficient to trigger the exploit. The file's SHA256 hash is provided 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
373e8d2a42c03bf3cc7d52b2a1c75d43932f47d88bda543513c0b95977c41e6e		 ole-package OLE Ole10Native stream: MBD02668C8C/oLe10nAtIvE 1645 bytes

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