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

Static analysis result for SHA-256 b6c451a9c2c7174e…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: c37eb436bbd32001d6b1b81d2cab6819 SHA-1: aed04556a3061f6dba50b5503e6864fb91c01716 SHA-256: b6c451a9c2c7174e6ab0c75d4a926390fcefe188dd421057eda0c80b98f06ba2
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates that this file exploits a vulnerability in the Equation Editor component of Microsoft Office. This is a common method for delivering malicious payloads, often leading to further compromise. No VBA macros were found to be executable, and the document body was unreadable, suggesting the exploit is the primary attack vector.

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
43c25780730516f2c7cc03c1a632d43e1f8f54f530aaad35644def82e6aba697		 ole-package OLE Ole10Native stream: MBD01C4AD19/oLe10NAtIVE 1369 bytes

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