Office (OLE) / .XLSX malware analysis — malicious · 93a71008a2294209

MALICIOUS

Office (OLE) / .XLSX

630.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-24

MD5: 1a3e6d3672c71fd1775411275e9322b7 SHA-1: c73b600f2929ec0f7b1600b85d3f596ab9755f6d SHA-256: 93a71008a2294209a986d896b26e8bcff214afc6923323687c9281919c033a91

148 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing this exploit payload strongly suggests the file is designed to leverage this vulnerability upon opening. No VBA macros were found to be executable, and the document body was unreadable, but the Equation Editor exploit is sufficient to classify this as a malicious delivery mechanism.

Heuristics 4

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)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `aebfa3cc9cffd1af88424a4828f90c2a91932c7006bd1640e9ae65f18d99a7e2`	ole-package	OLE Ole10Native stream: MBD02CE9B52/Ole10Native	167172 bytes
`ole10native_01.bin` `1674be226338d4d21664f1a34e18158807568cedf376401327aa895a6988facc`	ole-package	OLE Ole10Native stream: MBD02CE9B53/OLe10NaTive	1743 bytes

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