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

Static analysis result for SHA-256 c1ae63e3ffbf852d…

MALICIOUS

Office (OLE) / .XLS

1.43 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-15
MD5: ff3dec692c560ddba2ccfdd5a87c9659 SHA-1: 38155ba41afc472ed079128f2304aad872c4d813 SHA-256: c1ae63e3ffbf852dc71292b46575b38f9bbaf0ec45274fd9be664a785aa679fc
168 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains a malicious OLE object exploiting CVE-2017-11882 within Microsoft Equation Editor. This vulnerability is known to be used for initial execution, often leading to the download and execution of further malicious payloads. While no specific download URL or second-stage payload was directly extracted, the critical heuristic firings strongly indicate this exploit vector.

Heuristics 4

  • 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.
  • ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
  • 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
f3cce50be82e89cdee85d8410db6b4b9eadfc4d1750e61a8dde372271947bef0		 ole-package OLE Ole10Native stream: MBD01467D6A/oLe10NaTiVe 1480 bytes

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