Office (OLE) / .XLS malware analysis — malicious · 7e4e2d9ab7a1a27b

MALICIOUS

Office (OLE) / .XLS

224.0 KB Created: 2020-10-21 09:58:10 Authoring application: Microsoft Excel

MD5: 103b97a2a12a391a77c5b0553ecb5d73 SHA-1: e5b481148cdb2113f0b25f3698dfc2053b1163e3 SHA-256: 7e4e2d9ab7a1a27b10078f7377f19109cfab4156295f3f8fd91649f5876ad911

502 Risk Score

Malware Insights

MITRE ATT&CK

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

This Excel file contains obfuscated VBA macros designed to execute automatically upon opening, as indicated by the Workbook_Open event and multiple critical heuristic firings. The script utilizes WScript.Shell to access special folders and is designed to download and execute a second-stage payload, a common technique for malware droppers. The presence of a 'enable content' lure further supports its malicious intent.

Heuristics 12

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.
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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` `fd50f546d2e243f8927e2d485323da165db768d12f0be839300836ed58b2c4cb`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	37686 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 113 long base64-like blob(s).

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