purecrypter | 305cfdd7d464938cabe66fcf3116df431c10742c775a4a588d38349ea18a7fb6

Analysis

max time kernel
81s
max time network
150s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
05-02-2023 16:16

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General

Target

BLToolsMod.exe
Size

763KB
MD5

869037e716218fb7551d84b8ce7d0ae7
SHA1

12cb776519eeb2d5e6a7ab1ddce3a09f143d5f18
SHA256

305cfdd7d464938cabe66fcf3116df431c10742c775a4a588d38349ea18a7fb6
SHA512

6840e10d1daeacd169dba4a0049bc3b9087726dd45551b9a9587d57ec45d926356ce1656a39fdf35c1acb4020c564ec1f6a910fd83cde99e3ff75195728c72d2
SSDEEP

12288:SAZdPU5ttcsREhy5IYU8OaNISOvsk0gnT467zpmw7OfimWm/YfdFxfJ:S2UVc+EhyuAOaNIBXnT46fpmiOfimWy4

Score

10^/10

purecrypter quasar revengerat office04 downloader loader persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

Office04

youhackernetpaingodxd.duckdns.org:5557

blablashitspreading.ddns.net:5557

Mutex

xEoEv3HHdyEIYwJRFM

Attributes

encryption_key
w3WfcmWh1iXT9cxeKFEX
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/1244-66-0x0000000007470000-0x00000000076DE000-memory.dmp	family_purecrypter

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 6 IoCs

resource	yara_rule
behavioral1/memory/1680-76-0x0000000000400000-0x000000000044E000-memory.dmp	family_quasar
behavioral1/memory/1680-77-0x0000000000400000-0x000000000044E000-memory.dmp	family_quasar
behavioral1/memory/1680-78-0x0000000000400000-0x000000000044E000-memory.dmp	family_quasar
behavioral1/memory/1680-79-0x00000000004494BE-mapping.dmp	family_quasar
behavioral1/memory/1680-81-0x0000000000400000-0x000000000044E000-memory.dmp	family_quasar
behavioral1/memory/1680-83-0x0000000000400000-0x000000000044E000-memory.dmp	family_quasar

RevengeRAT
Remote-access trojan with a wide range of capabilities.
trojan revengerat
Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
1244	Updater-File.exe

Loads dropped DLL 1 IoCs

pid	Process
1252	BLToolsMod.exe

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-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Windows\CurrentVersion\Run\Driver = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Driver.exe\""	Updater-File.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.

flow	ioc
11	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1244 set thread context of 1680	1244	Updater-File.exe	33

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1360	1252	WerFault.exe	27

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1444	powershell.exe
1244	Updater-File.exe
1244	Updater-File.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1252	BLToolsMod.exe
Token: SeDebugPrivilege	1244	Updater-File.exe
Token: SeDebugPrivilege	1444	powershell.exe
Token: SeDebugPrivilege	1680	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1680	RegAsm.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 1252 wrote to memory of 1244	1252	BLToolsMod.exe	28
PID 1252 wrote to memory of 1244	1252	BLToolsMod.exe	28
PID 1252 wrote to memory of 1244	1252	BLToolsMod.exe	28
PID 1252 wrote to memory of 1244	1252	BLToolsMod.exe	28
PID 1252 wrote to memory of 1244	1252	BLToolsMod.exe	28
PID 1252 wrote to memory of 1244	1252	BLToolsMod.exe	28
PID 1252 wrote to memory of 1244	1252	BLToolsMod.exe	28
PID 1252 wrote to memory of 1360	1252	BLToolsMod.exe	29
PID 1252 wrote to memory of 1360	1252	BLToolsMod.exe	29
PID 1252 wrote to memory of 1360	1252	BLToolsMod.exe	29
PID 1252 wrote to memory of 1360	1252	BLToolsMod.exe	29
PID 1244 wrote to memory of 1444	1244	Updater-File.exe	30
PID 1244 wrote to memory of 1444	1244	Updater-File.exe	30
PID 1244 wrote to memory of 1444	1244	Updater-File.exe	30
PID 1244 wrote to memory of 1444	1244	Updater-File.exe	30
PID 1244 wrote to memory of 1604	1244	Updater-File.exe	32
PID 1244 wrote to memory of 1604	1244	Updater-File.exe	32
PID 1244 wrote to memory of 1604	1244	Updater-File.exe	32
PID 1244 wrote to memory of 1604	1244	Updater-File.exe	32
PID 1244 wrote to memory of 1604	1244	Updater-File.exe	32
PID 1244 wrote to memory of 1604	1244	Updater-File.exe	32
PID 1244 wrote to memory of 1604	1244	Updater-File.exe	32
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33
PID 1244 wrote to memory of 1680	1244	Updater-File.exe	33

C:\Users\Admin\AppData\Local\Temp\BLToolsMod.exe
"C:\Users\Admin\AppData\Local\Temp\BLToolsMod.exe"
1⤵
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1252
- C:\Users\Admin\AppData\Roaming\Updater-File.exe
  "C:\Users\Admin\AppData\Roaming\Updater-File.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1244
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1444
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    3⤵
    PID:1604
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:1680
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1252 -s 1452
  2⤵
  - Program crash
  PID:1360

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Updater-File.exe

Filesize
6KB

MD5
be2c9d9f3e9206eb7d809157ea37d0ea

SHA1
79fc984efb6d9e58c21f7c5dee8de2fc44710f62

SHA256
f07ca31e483745ac9fe74da53f939a797f3f8868717eb29f9f0d1286b89f6b79

SHA512
2510583a2690be0c48614fa21d24c2919d6c4f704d897ed4bb5a523d0bbc3616bd2aba7a6b22120068a24aa756a9b6f37feeb2b8eb461b86c2eacde935478d4b

Download Submit
C:\Users\Admin\AppData\Roaming\Updater-File.exe

Filesize
6KB

MD5
be2c9d9f3e9206eb7d809157ea37d0ea

SHA1
79fc984efb6d9e58c21f7c5dee8de2fc44710f62

SHA256
f07ca31e483745ac9fe74da53f939a797f3f8868717eb29f9f0d1286b89f6b79

SHA512
2510583a2690be0c48614fa21d24c2919d6c4f704d897ed4bb5a523d0bbc3616bd2aba7a6b22120068a24aa756a9b6f37feeb2b8eb461b86c2eacde935478d4b

Download Submit
\Users\Admin\AppData\Roaming\Updater-File.exe

Filesize
6KB

MD5
be2c9d9f3e9206eb7d809157ea37d0ea

SHA1
79fc984efb6d9e58c21f7c5dee8de2fc44710f62

SHA256
f07ca31e483745ac9fe74da53f939a797f3f8868717eb29f9f0d1286b89f6b79

SHA512
2510583a2690be0c48614fa21d24c2919d6c4f704d897ed4bb5a523d0bbc3616bd2aba7a6b22120068a24aa756a9b6f37feeb2b8eb461b86c2eacde935478d4b

Download Submit
memory/1244-66-0x0000000007470000-0x00000000076DE000-memory.dmp

Filesize
2.4MB

Download
memory/1244-62-0x0000000000BA0000-0x0000000000BA8000-memory.dmp

Filesize
32KB

Download
memory/1244-72-0x0000000005430000-0x000000000548E000-memory.dmp

Filesize
376KB

Download
memory/1252-57-0x0000000075931000-0x0000000075933000-memory.dmp

Filesize
8KB

Download
memory/1252-56-0x0000000000290000-0x0000000000296000-memory.dmp

Filesize
24KB

Download
memory/1252-65-0x00000000012B5000-0x00000000012C6000-memory.dmp

Filesize
68KB

Download
memory/1252-55-0x0000000007000000-0x0000000007156000-memory.dmp

Filesize
1.3MB

Download
memory/1252-54-0x00000000013B0000-0x0000000001474000-memory.dmp

Filesize
784KB

Download
memory/1444-70-0x000000006C8E0000-0x000000006CE8B000-memory.dmp

Filesize
5.7MB

Download
memory/1444-71-0x000000006C8E0000-0x000000006CE8B000-memory.dmp

Filesize
5.7MB

Download
memory/1444-69-0x000000006C8E0000-0x000000006CE8B000-memory.dmp

Filesize
5.7MB

Download
memory/1680-73-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/1680-74-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/1680-76-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/1680-77-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/1680-78-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/1680-81-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/1680-83-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download