Office (OLE) / .XLS malware analysis — malicious · 201c00b7ea683d8c

MALICIOUS

Office (OLE) / .XLS

105.5 KB Created: 2021-12-29 06:52:36 Authoring application: Microsoft Excel First seen: 2022-03-31

MD5: f6b6e5a98a5167e8f131ad1439bda389 SHA-1: 2f2d304a818e1fc012aa998bf2eeb2bfb5a8287f SHA-256: 201c00b7ea683d8cab5258d72b88f13a10b69cf31d045d99b2e75d37735ac63c

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro is triggered upon opening the spreadsheet, which then uses the Shell() function to execute a downloaded payload. The script reconstructs the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy for persistence and attempts to download a file from http://www.example.com/path/to/payload.exe. The ClamAV detection 'Doc.Downloader.DocuSign04220-9942585-0' further supports its role as a downloader.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Doc.Downloader.DocuSign04220-9942585-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.DocuSign04220-9942585-0
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `665f09781fb250e14f44733a22419dd8ce9101e4657189e6d85b9b27b07ab03f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	9447 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 99 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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