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

Static analysis result for SHA-256 85d6b555ded7367b…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-23
MD5: 58e7c1683df36fe4dddfc8d130fdaa1e SHA-1: f5d764177528466ab54cbd62a63ddfddf45a15b9 SHA-256: 85d6b555ded7367b59e072d50f1b0188f1bf462dec4df03e660d5c8b915597e4
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This vulnerability is commonly leveraged to deliver secondary payloads. Although no specific VBA code was extracted, the presence of the Equation Editor OLE object strongly suggests an exploit attempt. The file's metadata and verdict confirm its malicious nature.

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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
f954902dde9eb663e570bfa059971d837b177adc920ce7361d29adba9c57d30b		 ole-package OLE Ole10Native stream: MBD02799F52/oLE10nATiVe 1729 bytes

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