Office (OLE) / .XLS malware analysis — malicious · 9f81b53040821627

MALICIOUS

Office (OLE) / .XLS

701.5 KB Created: 2021-03-10 21:00:56 Authoring application: Microsoft Excel

MD5: a984000c3d335cf713fe56171f10daeb SHA-1: 43a83e644292c90454d4d4fc87369fae15d3324a SHA-256: 9f81b53040821627abfbf34ae2885afd89d9215ae3bce74c31958d3511e257f4

262 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1218.005 Client Execution

The sample is an Excel file containing a Workbook_Open VBA macro. This macro utilizes CreateObject and references Windows Script Host, indicating it's designed to execute external commands. The presence of a suspicious URL suggests the macro's purpose is to download and execute a second-stage payload. The macro's auto-execution and use of WScript are strong indicators of malicious intent.

Heuristics 8

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.
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.

URL http://afms.org.uk/js/mega.ex

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `63bf684dbb7a76e946eb31037f8089c96739e7336d9bbea7d0e87ecdc9c250a4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1182 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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