Overview
overview
10Static
static
10Bloxstrap-...in.zip
windows7-x64
1Bloxstrap-...in.zip
windows10-2004-x64
1Bloxstrap-....1.exe
windows7-x64
10Bloxstrap-....1.exe
windows10-2004-x64
10Bloxstrap-...I2.dll
windows7-x64
1Bloxstrap-...I2.dll
windows10-2004-x64
1Bloxstrap-...el.sys
windows10-2004-x64
1Bloxstrap-...er.dll
windows7-x64
1Bloxstrap-...er.dll
windows10-2004-x64
3Bloxstrap-...ec.lnk
windows7-x64
3Bloxstrap-...ec.lnk
windows10-2004-x64
3Bloxstrap-...ce.lnk
windows7-x64
3Bloxstrap-...ce.lnk
windows10-2004-x64
3Behavioral task
behavioral1
Sample
Bloxstrap-v2.5.1-main.zip
Resource
win7-20240508-en
Behavioral task
behavioral2
Sample
Bloxstrap-v2.5.1-main.zip
Resource
win10v2004-20240426-en
Behavioral task
behavioral3
Sample
Bloxstrap-v2.5.1-main/BloxStrap v2.5.4.1.exe
Resource
win7-20240508-en
Behavioral task
behavioral4
Sample
Bloxstrap-v2.5.1-main/BloxStrap v2.5.4.1.exe
Resource
win10v2004-20240426-en
Behavioral task
behavioral5
Sample
Bloxstrap-v2.5.1-main/Guna.UI2.dll
Resource
win7-20240508-en
Behavioral task
behavioral6
Sample
Bloxstrap-v2.5.1-main/Guna.UI2.dll
Resource
win10v2004-20240426-en
Behavioral task
behavioral7
Sample
Bloxstrap-v2.5.1-main/Kernel.sys
Resource
win10v2004-20240508-en
Behavioral task
behavioral8
Sample
Bloxstrap-v2.5.1-main/WebView2Loader.dll
Resource
win7-20231129-en
Behavioral task
behavioral9
Sample
Bloxstrap-v2.5.1-main/WebView2Loader.dll
Resource
win10v2004-20240426-en
Behavioral task
behavioral10
Sample
Bloxstrap-v2.5.1-main/autoexec.lnk
Resource
win7-20240221-en
Behavioral task
behavioral11
Sample
Bloxstrap-v2.5.1-main/autoexec.lnk
Resource
win10v2004-20240426-en
Behavioral task
behavioral12
Sample
Bloxstrap-v2.5.1-main/aworkspace.lnk
Resource
win7-20240221-en
Behavioral task
behavioral13
Sample
Bloxstrap-v2.5.1-main/aworkspace.lnk
Resource
win10v2004-20240426-en
General
-
Target
Bloxstrap-v2.5.1-main.zip
-
Size
2.0MB
-
MD5
25790aafc4aabb458ab707091f00720b
-
SHA1
88f983ab032829b05c2d532eec74769c016b5a63
-
SHA256
e46ddb2b2b2cc74e8306adc682228969d35e2943a917e321bd5db72e744d2d05
-
SHA512
99e8e2d7ad2c17edb9edc11a22b6c1fa9b5ffeb49f34f0cb45d74f269fc0c8bba6527d82a54251c1fe54b6484abc0d8b8a8a6f59811b725031991a6fbd642d4f
-
SSDEEP
49152:2EYoWSwCXw0TX1ohooPlv5MP/KFITYbNbNWo4kSH3OqtwIYJ4:HYNqlo7lxMPiFIT4bNJFY3Oqtv
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.114:4782
10d94abb-0198-407e-aa98-bb80c5b37835
-
encryption_key
45C885494447187E9FBAD6C4E1ACD4A1590FC706
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Runtime
-
subdirectory
SubDir
Signatures
-
AgentTesla payload 1 IoCs
resource yara_rule static1/unpack001/Bloxstrap-v2.5.1-main/Guna.UI2.dll family_agenttesla -
Agenttesla family
-
Quasar family
-
Quasar payload 1 IoCs
resource yara_rule static1/unpack001/Bloxstrap-v2.5.1-main/BloxStrap v2.5.4.1.exe family_quasar -
Unsigned PE 1 IoCs
Checks for missing Authenticode signature.
resource unpack001/Bloxstrap-v2.5.1-main/BloxStrap v2.5.4.1.exe
Files
-
Bloxstrap-v2.5.1-main.zip.zip
-
Bloxstrap-v2.5.1-main/BloxStrap v2.5.4.1.exe.exe windows:4 windows x86 arch:x86
f34d5f2d4577ed6d9ceec516c1f5a744
Headers
DLL Characteristics
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_NO_SEH
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE
File Characteristics
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_32BIT_MACHINE
Imports
mscoree
_CorExeMain
Sections
.text Size: 3.1MB - Virtual size: 3.1MB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rsrc Size: 3KB - Virtual size: 2KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.reloc Size: 512B - Virtual size: 12B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
-
Bloxstrap-v2.5.1-main/Guna.UI2.dll.dll windows:4 windows x86 arch:x86
dae02f32a21e03ce65412f6e56942daa
Code Sign
7a:98:1b:7d:3e:b4:86:bb:45:84:c4:3c:c9:a8:3f:dbCertificate
IssuerCN=Sobatdata Root CANot Before23/10/2019, 05:22Not After22/10/2025, 17:00SubjectCN=Sobatdata Software0e:9b:18:8e:f9:d0:2d:e7:ef:db:50:e2:08:40:18:5aCertificate
IssuerCN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=USNot Before01/08/2022, 00:00Not After09/11/2031, 23:59SubjectCN=DigiCert Trusted Root G4,OU=www.digicert.com,O=DigiCert Inc,C=USKey Usages
KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign
07:36:37:b7:24:54:7c:d8:47:ac:fd:28:66:2a:5e:5bCertificate
IssuerCN=DigiCert Trusted Root G4,OU=www.digicert.com,O=DigiCert Inc,C=USNot Before23/03/2022, 00:00Not After22/03/2037, 23:59SubjectCN=DigiCert Trusted G4 RSA4096 SHA256 TimeStamping CA,O=DigiCert\, Inc.,C=USExtended Key Usages
ExtKeyUsageTimeStamping
Key Usages
KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign
05:44:af:f3:94:9d:08:39:a6:bf:db:3f:5f:e5:61:16Certificate
IssuerCN=DigiCert Trusted G4 RSA4096 SHA256 TimeStamping CA,O=DigiCert\, Inc.,C=USNot Before14/07/2023, 00:00Not After13/10/2034, 23:59SubjectCN=DigiCert Timestamp 2023,O=DigiCert\, Inc.,C=USExtended Key Usages
ExtKeyUsageTimeStamping
Key Usages
KeyUsageDigitalSignature
47:b4:cf:f5:c2:a1:e0:36:e9:3f:b8:c2:44:a0:df:33:c2:26:10:62Signer
Actual PE Digest47:b4:cf:f5:c2:a1:e0:36:e9:3f:b8:c2:44:a0:df:33:c2:26:10:62Digest Algorithmsha1PE Digest MatchestrueHeaders
DLL Characteristics
IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_NO_SEH
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE
File Characteristics
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE
IMAGE_FILE_DLL
Imports
mscoree
_CorDllMain
Sections
.text Size: 2.1MB - Virtual size: 2.1MB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rsrc Size: 1KB - Virtual size: 1KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.reloc Size: 512B - Virtual size: 12B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
-
Bloxstrap-v2.5.1-main/Kernel.sys.sys windows:10 windows x64 arch:x64
359ca82ee879be4c8360522beea9202e
Code Sign
0c:e7:e0:e5:17:d8:46:fe:8f:e5:60:fc:1b:f0:30:39Certificate
IssuerCN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=USNot Before10/11/2006, 00:00Not After10/11/2031, 00:00SubjectCN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=USKey Usages
KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign
04:09:18:1b:5f:d5:bb:66:75:53:43:b5:6f:95:50:08Certificate
IssuerCN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=USNot Before22/10/2013, 12:00Not After22/10/2028, 12:00SubjectCN=DigiCert SHA2 Assured ID Code Signing CA,OU=www.digicert.com,O=DigiCert Inc,C=USExtended Key Usages
ExtKeyUsageCodeSigning
Key Usages
KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign
0b:88:60:32:86:1d:95:53:c6:8f:80:33:13:a9:89:75Certificate
IssuerCN=DigiCert SHA2 Assured ID Code Signing CA,OU=www.digicert.com,O=DigiCert Inc,C=USNot Before11/03/2021, 00:00Not After05/06/2024, 23:59SubjectCN=Micro-Star International CO.\, LTD.,O=Micro-Star International CO.\, LTD.,L=Zhonghe District,ST=New Taipei City,C=TWExtended Key Usages
ExtKeyUsageCodeSigning
Key Usages
KeyUsageDigitalSignature
0e:9b:18:8e:f9:d0:2d:e7:ef:db:50:e2:08:40:18:5aCertificate
IssuerCN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=USNot Before01/08/2022, 00:00Not After09/11/2031, 23:59SubjectCN=DigiCert Trusted Root G4,OU=www.digicert.com,O=DigiCert Inc,C=USKey Usages
KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign
07:36:37:b7:24:54:7c:d8:47:ac:fd:28:66:2a:5e:5bCertificate
IssuerCN=DigiCert Trusted Root G4,OU=www.digicert.com,O=DigiCert Inc,C=USNot Before23/03/2022, 00:00Not After22/03/2037, 23:59SubjectCN=DigiCert Trusted G4 RSA4096 SHA256 TimeStamping CA,O=DigiCert\, Inc.,C=USExtended Key Usages
ExtKeyUsageTimeStamping
Key Usages
KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign
05:44:af:f3:94:9d:08:39:a6:bf:db:3f:5f:e5:61:16Certificate
IssuerCN=DigiCert Trusted G4 RSA4096 SHA256 TimeStamping CA,O=DigiCert\, Inc.,C=USNot Before14/07/2023, 00:00Not After13/10/2034, 23:59SubjectCN=DigiCert Timestamp 2023,O=DigiCert\, Inc.,C=USExtended Key Usages
ExtKeyUsageTimeStamping
Key Usages
KeyUsageDigitalSignature
39:52:81:07:fb:31:0a:24:0a:0b:8e:5f:51:cc:eb:8d:25:22:ba:30Signer
Actual PE Digest39:52:81:07:fb:31:0a:24:0a:0b:8e:5f:51:cc:eb:8d:25:22:ba:30Digest Algorithmsha1PE Digest MatchestrueHeaders
DLL Characteristics
IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_GUARD_CF
File Characteristics
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE
PDB Paths
D:\projects\Enigma\Enigma Driver\bin\driver.pdb
Imports
ntoskrnl.exe
RtlInitAnsiString
RtlAnsiStringToUnicodeString
RtlCompareUnicodeString
RtlFreeUnicodeString
ExGetPreviousMode
ObfDereferenceObject
PsLookupProcessByProcessId
PsGetProcessPeb
PsGetProcessSectionBaseAddress
ExAllocatePoolWithTag
ExFreePoolWithTag
MmGetPhysicalMemoryRanges
DbgPrintEx
RtlGetVersion
MmUnmapIoSpace
MmMapIoSpaceEx
MmCopyMemory
RtlInitUnicodeString
RtlUnicodeStringToAnsiString
RtlFreeAnsiString
ExAllocatePool
RtlEqualString
ZwQuerySystemInformation
Sections
.text Size: 7KB - Virtual size: 7KB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rdata Size: 2KB - Virtual size: 2KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.data Size: 512B - Virtual size: 176B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
.pdata Size: 512B - Virtual size: 480B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
INIT Size: 1024B - Virtual size: 768B
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.reloc Size: 512B - Virtual size: 36B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
-
Bloxstrap-v2.5.1-main/WebView2Loader.dll.dll windows:5 windows x86 arch:x86
608537c42a46a95b31cc1ef01ab6eeb0
Code Sign
33:00:00:02:ce:78:d4:2c:89:f8:69:73:53:00:00:00:00:02:ceCertificate
IssuerCN=Microsoft Code Signing PCA 2011,O=Microsoft Corporation,L=Redmond,ST=Washington,C=USNot Before12/05/2022, 20:46Not After11/05/2023, 20:46SubjectCN=Microsoft Corporation,O=Microsoft Corporation,L=Redmond,ST=Washington,C=USExtended Key Usages
ExtKeyUsageCodeSigning
61:0e:90:d2:00:00:00:00:00:03Certificate
IssuerCN=Microsoft Root Certificate Authority 2011,O=Microsoft Corporation,L=Redmond,ST=Washington,C=USNot Before08/07/2011, 20:59Not After08/07/2026, 21:09SubjectCN=Microsoft Code Signing PCA 2011,O=Microsoft Corporation,L=Redmond,ST=Washington,C=USKey Usages
KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign
ca:02:be:45:23:1a:4f:c5:9a:bd:e9:c0:64:b8:65:28:f9:1f:9e:45:9e:b9:55:0d:0f:c0:fb:3d:ec:41:42:40Signer
Actual PE Digestca:02:be:45:23:1a:4f:c5:9a:bd:e9:c0:64:b8:65:28:f9:1f:9e:45:9e:b9:55:0d:0f:c0:fb:3d:ec:41:42:40Digest Algorithmsha256PE Digest MatchestrueHeaders
DLL Characteristics
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_GUARD_CF
File Characteristics
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE
IMAGE_FILE_32BIT_MACHINE
IMAGE_FILE_DLL
PDB Paths
D:\a\_work\e\src\out\Release\WebView2Loader.dll.pdb
Imports
kernel32
CloseHandle
CreateEventW
CreateFileW
DecodePointer
DeleteCriticalSection
EncodePointer
EnterCriticalSection
ExitProcess
FindClose
FindFirstFileExW
FindNextFileW
FlushFileBuffers
FreeEnvironmentStringsW
FreeLibrary
GetACP
GetCPInfo
GetCommandLineA
GetCommandLineW
GetConsoleMode
GetConsoleOutputCP
GetCurrentProcess
GetCurrentProcessId
GetCurrentThreadId
GetEnvironmentStringsW
GetEnvironmentVariableW
GetFileAttributesW
GetFileType
GetLastError
GetModuleFileNameW
GetModuleHandleExW
GetModuleHandleW
GetOEMCP
GetProcAddress
GetProcessHeap
GetStartupInfoW
GetStdHandle
GetStringTypeW
GetSystemInfo
GetSystemTimeAsFileTime
HeapAlloc
HeapFree
HeapReAlloc
HeapSize
InitializeCriticalSectionAndSpinCount
InitializeSListHead
InterlockedFlushSList
IsDebuggerPresent
IsProcessorFeaturePresent
IsValidCodePage
LCMapStringW
LeaveCriticalSection
LoadLibraryExA
LoadLibraryExW
LoadLibraryW
MultiByteToWideChar
OutputDebugStringA
OutputDebugStringW
QueryPerformanceCounter
RaiseException
ResetEvent
RtlUnwind
SetEvent
SetFilePointerEx
SetLastError
SetStdHandle
SetUnhandledExceptionFilter
TerminateProcess
TlsAlloc
TlsFree
TlsGetValue
TlsSetValue
UnhandledExceptionFilter
VirtualProtect
VirtualQuery
WaitForSingleObjectEx
WideCharToMultiByte
WriteConsoleW
WriteFile
Exports
Exports
CompareBrowserVersions
CreateCoreWebView2Environment
CreateCoreWebView2EnvironmentWithOptions
GetAvailableCoreWebView2BrowserVersionString
Sections
.text Size: 62KB - Virtual size: 61KB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rdata Size: 29KB - Virtual size: 28KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.data Size: 2KB - Virtual size: 5KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
.00cfg Size: 512B - Virtual size: 4B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.tls Size: 512B - Virtual size: 9B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
.voltbl Size: 512B - Virtual size: 36B
.rsrc Size: 1KB - Virtual size: 1KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.reloc Size: 5KB - Virtual size: 4KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
-
Bloxstrap-v2.5.1-main/autoexec.lnk.lnk
-
Bloxstrap-v2.5.1-main/aworkspace.lnk.lnk