Office (OLE) / .XLS malware analysis — malicious · 1ad800d0b4036fbd

MALICIOUS

Office (OLE) / .XLS

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

MD5: 94abf4cc557c5a2466b583fb998137c8 SHA-1: 5a26d77d211f702c4649fe296fef975801886163 SHA-256: 1ad800d0b4036fbd5ef2ff9404ec21dec4c8a506b345fdda0a3d254151ee8004

300 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a malicious Excel spreadsheet containing a Workbook_Open macro. This macro executes obfuscated VBA code that reconstructs the string "http://192.168.1.100/putty.exe" and attempts to download and execute it as "C:\Users\Public\putty.exe". The use of Shell() and CreateObject() calls, along with VBA string obfuscation, indicates a downloader functionality.

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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