Office (OLE) / .XLS malware analysis — malicious · e922916214a015a4

MALICIOUS

Office (OLE) / .XLS

158.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel

MD5: f4d75ac5ddd1b72169f1d188d893814f SHA-1: ad62662677718d442de1e6a192675b3a91a15ea7 SHA-256: e922916214a015a499123249001cdfb4b87aa2daf4e4a595e91b45e7880d7ec8

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This XLS file contains a Workbook_Open VBA macro, which is a common technique for executing malicious code upon opening. The macro utilizes Shell() and CreateObject() calls, indicating it likely downloads and executes a second-stage payload. The presence of a long encoded blob and VBA auto-execution with execution terms further supports this. The ClamAV detection of 'Xls.Malware.Valyria-10032137-0' suggests a known malware variant, but specific family attribution is not possible from the provided heuristics.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Xls.Malware.Valyria-10032137-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10032137-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high 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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `6278fa7f173f520160d37ae08103ddc554d15228b972ed6801c890f4ceaae6d3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	35420 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 111 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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