purecrypter | 93b17c9c6d764b7e218d2d1669e8bd68059da3fe346936071b012d22d52fb35e

Analysis

max time kernel
150s
max time network
46s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
27-01-2023 20:30

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General

Target

vbc.exe
Size

24KB
MD5

28cfc00452c4e3e6c0082fdca3c520fc
SHA1

1260166c856aee0225371c7ab269f3a228cf8fb5
SHA256

93b17c9c6d764b7e218d2d1669e8bd68059da3fe346936071b012d22d52fb35e
SHA512

8413d173f55e5fe9d8fd415fd1f9e76358916ee1de5d1e6dbab3a1b18b0848011e76f7a2ee332f4fca64e8dcb26a8d1492c8d1ebe9ad165eba84c8dda6065af8
SSDEEP

96:IEfPqlezZjTldKYgr+Doo+HzQLCmNeit3l/kSw6k7l6xiRQe3T3erAo00wGvzNt:IEfPql6VpJ/oGlL/kHH7l6Ej7e

Score

10^/10

purecrypter smokeloader backdoor downloader loader persistence trojan

Malware Config

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/1264-56-0x0000000006120000-0x0000000006376000-memory.dmp	family_purecrypter

Detects Smokeloader packer 4 IoCs

resource	yara_rule
behavioral1/memory/468-66-0x0000000000400000-0x0000000000409000-memory.dmp	family_smokeloader
behavioral1/memory/468-67-0x0000000000402EF0-mapping.dmp	family_smokeloader
behavioral1/memory/468-69-0x0000000000400000-0x0000000000409000-memory.dmp	family_smokeloader
behavioral1/memory/468-70-0x0000000000400000-0x0000000000409000-memory.dmp	family_smokeloader

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
SmokeLoader
Modular backdoor trojan in use since 2014.
trojan backdoor smokeloader
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\Run\Lbjfpqx = "\"C:\\Users\\Admin\\AppData\\Roaming\\Zkevyyhtxab\\Lbjfpqx.exe\""	vbc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1264 set thread context of 468	1264	vbc.exe	30

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key enumerated	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	vbc.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	vbc.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1648	powershell.exe
468	vbc.exe
468	vbc.exe
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found
1232	Process not Found

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
468	vbc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1264	vbc.exe
Token: SeDebugPrivilege	1648	powershell.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1264 wrote to memory of 1648	1264	vbc.exe	28
PID 1264 wrote to memory of 1648	1264	vbc.exe	28
PID 1264 wrote to memory of 1648	1264	vbc.exe	28
PID 1264 wrote to memory of 1648	1264	vbc.exe	28
PID 1264 wrote to memory of 468	1264	vbc.exe	30
PID 1264 wrote to memory of 468	1264	vbc.exe	30
PID 1264 wrote to memory of 468	1264	vbc.exe	30
PID 1264 wrote to memory of 468	1264	vbc.exe	30
PID 1264 wrote to memory of 468	1264	vbc.exe	30
PID 1264 wrote to memory of 468	1264	vbc.exe	30
PID 1264 wrote to memory of 468	1264	vbc.exe	30

C:\Users\Admin\AppData\Local\Temp\vbc.exe
"C:\Users\Admin\AppData\Local\Temp\vbc.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1264
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1648
- C:\Users\Admin\AppData\Local\Temp\vbc.exe
  C:\Users\Admin\AppData\Local\Temp\vbc.exe
  2⤵
  - Checks SCSI registry key(s)
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  PID:468

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

T1064

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Scripting

T1064

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/468-66-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/468-70-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/468-69-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/468-63-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/468-64-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1264-55-0x0000000076711000-0x0000000076713000-memory.dmp

Filesize
8KB

Download
memory/1264-56-0x0000000006120000-0x0000000006376000-memory.dmp

Filesize
2.3MB

Download
memory/1264-54-0x0000000000A30000-0x0000000000A3C000-memory.dmp

Filesize
48KB

Download
memory/1264-62-0x00000000056F0000-0x0000000005736000-memory.dmp

Filesize
280KB

Download
memory/1648-61-0x000000006FAE0000-0x000000007008B000-memory.dmp

Filesize
5.7MB

Download
memory/1648-60-0x000000006FAE0000-0x000000007008B000-memory.dmp

Filesize
5.7MB

Download
memory/1648-59-0x000000006FAE0000-0x000000007008B000-memory.dmp

Filesize
5.7MB

Download