Analysis
-
max time kernel
49s -
max time network
146s -
platform
windows7_x64 -
resource
win7-20230220-en -
resource tags
arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system -
submitted
01-06-2023 10:42
Behavioral task
behavioral1
Sample
Yoelcvrbdj.exe
Resource
win7-20230220-en
Behavioral task
behavioral2
Sample
Yoelcvrbdj.exe
Resource
win10v2004-20230220-en
General
-
Target
Yoelcvrbdj.exe
-
Size
19KB
-
MD5
e0848154f754c0cb4d9fce30e73d258c
-
SHA1
d854344383ac3fb8a6c81653df97dfb6ba47d7e0
-
SHA256
17e813ed934ac345e4b9b9384aaff9e5b7a20b4efc8f75ef784f06bde2420b2d
-
SHA512
4a9ea4ac5bf64494f0afdfe636397edfdb425329647aef7e8cc757e1794b350d90d7a10e839f52687364e605fcc7095d91890aa1d99cd1fe3820ac9e5946581e
-
SSDEEP
384:Fzf4L7L/YLpr71JdWUyLJiCI5HNPNZJ9afejI:G//M3iJ/Ij8
Malware Config
Extracted
purecrypter
https://cdn.discordapp.com/attachments/1113754118750752801/1113762519178285166/Khdovdpst.bmp
Extracted
snakekeylogger
https://api.telegram.org/bot5996089921:AAFFEnbgTY8Gt8G5jJy6llKhDg_Ha193t7c/sendMessage?chat_id=2054148913
Signatures
-
PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
-
Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
-
Snake Keylogger payload 3 IoCs
Processes:
resource yara_rule behavioral1/memory/316-76-0x0000000140000000-0x0000000140024000-memory.dmp family_snakekeylogger behavioral1/memory/316-78-0x0000000140000000-0x0000000140024000-memory.dmp family_snakekeylogger behavioral1/memory/316-81-0x000000001B5A0000-0x000000001B620000-memory.dmp family_snakekeylogger -
Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
Processes:
MSBuild.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 MSBuild.exe Key opened \REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 MSBuild.exe Key opened \REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 MSBuild.exe -
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
Processes:
flow ioc 7 checkip.dyndns.org -
Suspicious use of SetThreadContext 1 IoCs
Processes:
Yoelcvrbdj.exedescription pid process target process PID 1540 set thread context of 316 1540 Yoelcvrbdj.exe MSBuild.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
-
Suspicious behavior: EnumeratesProcesses 3 IoCs
Processes:
powershell.exeMSBuild.exepid process 1112 powershell.exe 316 MSBuild.exe 316 MSBuild.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
Processes:
Yoelcvrbdj.exepowershell.exeMSBuild.exedescription pid process Token: SeDebugPrivilege 1540 Yoelcvrbdj.exe Token: SeDebugPrivilege 1112 powershell.exe Token: SeDebugPrivilege 316 MSBuild.exe -
Suspicious use of WriteProcessMemory 10 IoCs
Processes:
Yoelcvrbdj.exedescription pid process target process PID 1540 wrote to memory of 1112 1540 Yoelcvrbdj.exe powershell.exe PID 1540 wrote to memory of 1112 1540 Yoelcvrbdj.exe powershell.exe PID 1540 wrote to memory of 1112 1540 Yoelcvrbdj.exe powershell.exe PID 1540 wrote to memory of 316 1540 Yoelcvrbdj.exe MSBuild.exe PID 1540 wrote to memory of 316 1540 Yoelcvrbdj.exe MSBuild.exe PID 1540 wrote to memory of 316 1540 Yoelcvrbdj.exe MSBuild.exe PID 1540 wrote to memory of 316 1540 Yoelcvrbdj.exe MSBuild.exe PID 1540 wrote to memory of 316 1540 Yoelcvrbdj.exe MSBuild.exe PID 1540 wrote to memory of 316 1540 Yoelcvrbdj.exe MSBuild.exe PID 1540 wrote to memory of 316 1540 Yoelcvrbdj.exe MSBuild.exe -
outlook_office_path 1 IoCs
Processes:
MSBuild.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 MSBuild.exe -
outlook_win_path 1 IoCs
Processes:
MSBuild.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 MSBuild.exe
Processes
-
C:\Users\Admin\AppData\Local\Temp\Yoelcvrbdj.exe"C:\Users\Admin\AppData\Local\Temp\Yoelcvrbdj.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exeC:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe2⤵
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
memory/316-74-0x0000000140000000-0x0000000140024000-memory.dmpFilesize
144KB
-
memory/316-81-0x000000001B5A0000-0x000000001B620000-memory.dmpFilesize
512KB
-
memory/316-78-0x0000000140000000-0x0000000140024000-memory.dmpFilesize
144KB
-
memory/316-77-0x000007FFFFFDD000-0x000007FFFFFDE000-memory.dmpFilesize
4KB
-
memory/316-76-0x0000000140000000-0x0000000140024000-memory.dmpFilesize
144KB
-
memory/316-75-0x0000000140000000-0x0000000140024000-memory.dmpFilesize
144KB
-
memory/1112-63-0x000000001B110000-0x000000001B3F2000-memory.dmpFilesize
2.9MB
-
memory/1112-64-0x0000000002420000-0x0000000002428000-memory.dmpFilesize
32KB
-
memory/1112-67-0x0000000002510000-0x0000000002590000-memory.dmpFilesize
512KB
-
memory/1112-66-0x0000000002510000-0x0000000002590000-memory.dmpFilesize
512KB
-
memory/1112-65-0x0000000002510000-0x0000000002590000-memory.dmpFilesize
512KB
-
memory/1112-69-0x0000000002510000-0x0000000002590000-memory.dmpFilesize
512KB
-
memory/1112-70-0x0000000002510000-0x0000000002590000-memory.dmpFilesize
512KB
-
memory/1112-71-0x0000000002510000-0x0000000002590000-memory.dmpFilesize
512KB
-
memory/1112-72-0x0000000002510000-0x0000000002590000-memory.dmpFilesize
512KB
-
memory/1540-68-0x000000001B2D0000-0x000000001B350000-memory.dmpFilesize
512KB
-
memory/1540-54-0x0000000001350000-0x000000000135A000-memory.dmpFilesize
40KB
-
memory/1540-58-0x00000000012B0000-0x0000000001342000-memory.dmpFilesize
584KB
-
memory/1540-57-0x00000000001B0000-0x00000000001C0000-memory.dmpFilesize
64KB
-
memory/1540-56-0x000000001EDD0000-0x000000001EEC4000-memory.dmpFilesize
976KB
-
memory/1540-55-0x000000001B2D0000-0x000000001B350000-memory.dmpFilesize
512KB