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

Static analysis result for SHA-256 638853a1ec2b0db0…

MALICIOUS

Office (OLE) / .XLSX

572.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-06
MD5: 0345f8d939c4f9a5d7ce05b84094e81b SHA-1: 431ca4a5a651cf37d39179f0b5c831257392d0be SHA-256: 638853a1ec2b0db00bda9a40011ef9accec67a75d4ee6f8585cc1811f5c8f1a3
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. The document body contains a plausible-looking, but likely fake, purchase order designed to trick the user into opening the malicious object. No VBA macros were found to be executable, suggesting the exploit is the primary delivery mechanism.

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
29310f7f8fac685341855904527c290806a88358faad58c1a50571d6faef86a2		 ole-package OLE Ole10Native stream: MBD013315C0/Ole10NatIVE 1510 bytes

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