Office (OLE) / .DOC malware analysis — malicious · ca96847f1b419cbb

MALICIOUS

Office (OLE) / .DOC

1.53 MB First seen: 2022-07-26

MD5: ab0a05c913db89ae8be4f4dd80cb4e66 SHA-1: 21ee73f9770ac1f11395f9aadfda028efc3d3c90 SHA-256: ca96847f1b419cbb805966f54c45d851571343f81655d4651946a1843424b07f

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a critical heuristic indicating exploitation of CVE-2017-11882 through an embedded Equation Editor OLE object. The presence of a password-protected archive lure suggests the document is designed to trick the user into decrypting a subsequent payload. No scripts were extracted, but the embedded OLE object is the primary indicator of compromise.

Heuristics 5

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.
x86 GetPC stub (CALL $+5; POP EAX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EAX)
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ole10native_00.bin` `26aa731c0596dab73738a224e8b54eefbd251bf058bb056088ffc4e110a1c9c7`	ole-package	OLE Ole10Native stream: olE10nAtIVe	1586752 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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