Office (OLE) / .XLS malware analysis — malicious · d61e50d7a5f7aa30

MALICIOUS

Office (OLE) / .XLS

386.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel

MD5: 2c18205f1fc4fd8ee03332dd8ccd66d7 SHA-1: ca0c50b3137fdeb694ec3d9130250567d6cf89d5 SHA-256: d61e50d7a5f7aa30b6eb90ddf1acfda2cd9a875dab8e841dc71a0e7db15b6ecf

262 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The sample is an XLS file containing a Workbook_Open VBA macro. This macro utilizes CreateObject to execute a command, likely leveraging wscript to download and run a payload from the embedded URL. The presence of a Workbook_Open auto-execution routine and the CreateObject call strongly indicate a malicious intent to download and execute a secondary payload.

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://45.133.1.53/r5/ConsoleApp10.ex

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `56a2bbdedd7a9d6f5a20e3a3d455b220134e826b65e6d944a8886efdf05881b0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1207 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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