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

Static analysis result for SHA-256 81163131a2ec3faf…

MALICIOUS

Office (OLE) / .DOC

869.5 KB First seen: 2023-08-28
MD5: 3e1cf6f2494eb53bca88b2c3fa457d2a SHA-1: 65f34f8f92c6a3b4ffcfb8973880ce224ef5cea4 SHA-256: 81163131a2ec3fafb14d43e570ba4e31fef55653b4082b00aaf214c90ecc0f7b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a malicious Equation Editor OLE object, identified as exploiting CVE-2017-11882. This indicates the document is designed to execute arbitrary code upon opening. The embedded OLE object, named 'ole10native_00.bin', is the primary indicator of compromise.

Heuristics 2

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
06a176544c03670d0cfe7c3dbe7a09c92fbf31603c8d3e9a64e202b0a2c6ae11		 ole-package OLE Ole10Native stream: oLE10NAtivE 881111 bytes

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