purecrypter | c99b050645ebbc138018a9dcb4c3029bc1a9aa9376e7541c1011e815942948e1

Resubmissions

01-02-2023 17:02

230201-vj6p3aah39 10

01-02-2023 17:00

230201-vjf5eacg4s 10

01-02-2023 16:57

230201-vgbrxacg2y 10

Analysis

max time kernel
46s
max time network
144s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
01-02-2023 16:57

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General

Target

Acwpn.exe
Size

7KB
MD5

5828f5213c4721e4118b3e57388ff2a5
SHA1

6737cd48c485ed00f64d56f2996cb0a4b3e16db8
SHA256

1c1198c6de9cf636d4dc103add73a59ba3101ae38954f20f0ec6ed9b8c563dbd
SHA512

e90cc6a7debeb334a5569f0a69c3b1ef16d8a1b43ef3decc10bff8ae0e510e3e4d3ae8ca838fd4bc090aaece07c6ae0ab5a38f27aaff86e17e322b3e290cf428
SSDEEP

96:wUUIQg0soU3QSQKCJdsYB3TtmXdtEkdpBxNbFnU:wUUIPDQdsYF0tzbHk

Score

10^/10

purecrypter collection downloader loader

Malware Config

Signatures

Detect PureCrypter injector 1 IoCs

loader

Processes:

resource	yara_rule
behavioral7/memory/616-56-0x00000000067F0000-0x0000000006A66000-memory.dmp	family_purecrypter

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\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

9 checkip.dyndns.org
Suspicious use of SetThreadContext 1 IoCs

Processes:

Acwpn.exe

description pid process target process

PID 616 set thread context of 1692 616 Acwpn.exe MSBuild.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

powershell.exeMSBuild.exe

pid process

1600 powershell.exe
1692 MSBuild.exe
1692 MSBuild.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Acwpn.exepowershell.exeMSBuild.exe

description pid process

Token: SeDebugPrivilege 616 Acwpn.exe
Token: SeDebugPrivilege 1600 powershell.exe
Token: SeDebugPrivilege 1692 MSBuild.exe

flow	ioc
9	checkip.dyndns.org

description	pid	process	target process
PID 616 set thread context of 1692	616	Acwpn.exe	MSBuild.exe

pid	process
1600	powershell.exe
1692	MSBuild.exe
1692	MSBuild.exe

description	pid	process
Token: SeDebugPrivilege	616	Acwpn.exe
Token: SeDebugPrivilege	1600	powershell.exe
Token: SeDebugPrivilege	1692	MSBuild.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

Acwpn.exe

description	pid	process	target process
PID 616 wrote to memory of 1600	616	Acwpn.exe	powershell.exe
PID 616 wrote to memory of 1600	616	Acwpn.exe	powershell.exe
PID 616 wrote to memory of 1600	616	Acwpn.exe	powershell.exe
PID 616 wrote to memory of 1600	616	Acwpn.exe	powershell.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe
PID 616 wrote to memory of 1692	616	Acwpn.exe	MSBuild.exe

outlook_office_path 1 IoCs

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

outlook_win_path 1 IoCs

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

C:\Users\Admin\AppData\Local\Temp\Acwpn.exe
"C:\Users\Admin\AppData\Local\Temp\Acwpn.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:616

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:1600

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
2⤵
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:1692

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/616-54-0x0000000000F90000-0x0000000000F98000-memory.dmp

Filesize
32KB

Download
memory/616-55-0x0000000075931000-0x0000000075933000-memory.dmp

Filesize
8KB

Download
memory/616-56-0x00000000067F0000-0x0000000006A66000-memory.dmp

Filesize
2.5MB

Download
memory/616-62-0x00000000055E0000-0x0000000005646000-memory.dmp

Filesize
408KB

Download
memory/1600-57-0x0000000000000000-mapping.dmp

Download
memory/1600-59-0x000000006F670000-0x000000006FC1B000-memory.dmp

Filesize
5.7MB

Download
memory/1600-60-0x000000006F670000-0x000000006FC1B000-memory.dmp

Filesize
5.7MB

Download
memory/1600-61-0x000000006F670000-0x000000006FC1B000-memory.dmp

Filesize
5.7MB

Download
memory/1692-63-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/1692-64-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/1692-66-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/1692-68-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/1692-69-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/1692-72-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/1692-70-0x0000000000451A4E-mapping.dmp

Download
memory/1692-74-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download