Xls.Downloader.94c25b356b5a6cac-9978798-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 26ce04c7a20090a1…

MALICIOUS

Office (OLE) / .XLS

2.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-08
MD5: c918ec8388dbd07a40a1447cada9457a SHA-1: f82c57681d6f43dd514395694fd51e4feb0f7fce SHA-256: 26ce04c7a20090a1bf55a6a1efac50d5464f0bd4a511cde8caf03a5d7c44d2fb
168 Risk Score

Malware Insights

Xls.Downloader.94c25b356b5a6cac-9978798-0 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing a malicious OLE object exploiting CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution, and the ClamAV detection indicates it functions as a downloader. The VBA macros themselves do not contain executable statements, but the embedded OLE object is the primary vector for exploitation.

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
25af56a2572f1b1be9a8d07c36c7e26e8e705432296eea8e02adab8f902deae4		 ole-package OLE Ole10Native stream: MBD01A02BAC/OLe10NAtIve 1410 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.