Office (OLE) / .XLS malware analysis — malicious · 0a1dbab22dbec621

MALICIOUS

Office (OLE) / .XLS

160.5 KB Created: 2021-07-24 09:17:42 Authoring application: Microsoft Excel

MD5: 61a6b001d22f498345f96dc926a49453 SHA-1: bad86dbcd6f8bf965e2128ef9f9e9964ab1085cc SHA-256: 0a1dbab22dbec6219e9a4d934dadb167870a4f2e55eeea59d0aae9ad4dbfe17c

370 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter

The Excel file contains VBA macros, including a Workbook_Open event, which are designed to execute automatically. Critical heuristics indicate the use of WScript.Shell and a Shell() call, along with a direct indication of downloading and executing a file via HTTP. The obfuscated script further suggests malicious intent to download and run a payload, likely using the WScript.Shell object.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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.
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)
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `60564712c40774245b3bd17ea4ba3dd44b66eaa493f88a8b19308415c9541ca8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	57608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s).

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