Office (OLE) / .XLS malware analysis — malicious · 48fc22a168fc1d01

MALICIOUS

Office (OLE) / .XLS

395.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-10

MD5: 29231a8024d9d69dcd8e245326f04ce4 SHA-1: 5ed8c716ff1ae51b22d5be952eb3e0c4832afb76 SHA-256: 48fc22a168fc1d018242b7a75a28e8797bf6a1c0df814739565d6da896bc7fe7

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This vulnerability is commonly used to deliver secondary payloads. No VBA macros were found to contain executable statements, suggesting the primary malicious functionality resides within the embedded Equation Editor object.

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 EDX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EDX)
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.

Filename	Kind	Source	Size
`macros.bas` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `32fe9d63a9602b08d5278e2d478ddc34ce436b45a744bd7371cde6f5bb51e937`	ole-package	OLE Ole10Native stream: MBD021CD17C/olE10NaTIVE	1273 bytes

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