masslogger | f7d1402eb35c67bfb9f0cdf77c4050fc40c936fc0034d8b86bdbd20deed76db0

General

Target

CAII000080521.exe
Size

1.2MB
MD5

017ecc0d306245e81566079ecf525be6
SHA1

aa2f5b1650a9d26aca637a3d9b72e94e9acbd244
SHA256

f7d1402eb35c67bfb9f0cdf77c4050fc40c936fc0034d8b86bdbd20deed76db0
SHA512

0c12c196b414356fa04f1772b1562d7d3eaee5787b52fe2cf8697ffa4b317319db57dd1f13ce768cca9f6ef9bfb62c908d4fc7f448cfd8432f8d1c883a3ac7d2

Score

10^/10

persistence spyware stealer masslogger

Malware Config

Signatures

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

CAII000080521.execmd.exefirefoxx.exe

description	pid	process	target process
PID 1496 wrote to memory of 452	1496	CAII000080521.exe	cmd.exe
PID 1496 wrote to memory of 452	1496	CAII000080521.exe	cmd.exe
PID 1496 wrote to memory of 452	1496	CAII000080521.exe	cmd.exe
PID 1496 wrote to memory of 452	1496	CAII000080521.exe	cmd.exe
PID 452 wrote to memory of 1060	452	cmd.exe	reg.exe
PID 452 wrote to memory of 1060	452	cmd.exe	reg.exe
PID 452 wrote to memory of 1060	452	cmd.exe	reg.exe
PID 452 wrote to memory of 1060	452	cmd.exe	reg.exe
PID 1496 wrote to memory of 1692	1496	CAII000080521.exe	firefoxx.exe
PID 1496 wrote to memory of 1692	1496	CAII000080521.exe	firefoxx.exe
PID 1496 wrote to memory of 1692	1496	CAII000080521.exe	firefoxx.exe
PID 1496 wrote to memory of 1692	1496	CAII000080521.exe	firefoxx.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe
PID 1692 wrote to memory of 1868	1692	firefoxx.exe	RegAsm.exe

Loads dropped DLL 3 IoCs

Processes:

CAII000080521.exefirefoxx.exeRegAsm.exe

pid process

1496 CAII000080521.exe
1692 firefoxx.exe
1868 RegAsm.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

firefoxx.exe

description pid process target process

PID 1692 set thread context of 1868 1692 firefoxx.exe RegAsm.exe

pid	process
1496	CAII000080521.exe
1692	firefoxx.exe
1868	RegAsm.exe

description	pid	process	target process
PID 1692 set thread context of 1868	1692	firefoxx.exe	RegAsm.exe

Adds Run entry to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1131729243-447456001-3632642222-1000\Software\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1131729243-447456001-3632642222-1000\Software\Microsoft\Windows\CurrentVersion\Run\firefoxx = "C:\\Windows\\system32\\pcalua.exe -a C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\firefoxx.exe"	reg.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081
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

5 api.ipify.org
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

CAII000080521.exefirefoxx.exeRegAsm.exe

description pid process

Token: SeDebugPrivilege 1496 CAII000080521.exe
Token: SeDebugPrivilege 1692 firefoxx.exe
Token: SeDebugPrivilege 1868 RegAsm.exe
Suspicious behavior: EnumeratesProcesses 7 IoCs

Processes:

CAII000080521.exefirefoxx.exeRegAsm.exe

pid process

1496 CAII000080521.exe
1496 CAII000080521.exe
1496 CAII000080521.exe
1692 firefoxx.exe
1692 firefoxx.exe
1692 firefoxx.exe
1868 RegAsm.exe
Executes dropped EXE 2 IoCs

Processes:

firefoxx.exeRegAsm.exe

pid process

1692 firefoxx.exe
1868 RegAsm.exe
MassLogger log file 1 IoCs
Detects a log file produced by MassLogger.

Processes:

yara_rule

masslogger_log_file
MassLogger
Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.
stealer spyware masslogger

flow	ioc
5	api.ipify.org

description	pid	process
Token: SeDebugPrivilege	1496	CAII000080521.exe
Token: SeDebugPrivilege	1692	firefoxx.exe
Token: SeDebugPrivilege	1868	RegAsm.exe

pid	process
1496	CAII000080521.exe
1496	CAII000080521.exe
1496	CAII000080521.exe
1692	firefoxx.exe
1692	firefoxx.exe
1692	firefoxx.exe
1868	RegAsm.exe

pid	process
1692	firefoxx.exe
1868	RegAsm.exe

yara_rule
masslogger_log_file

C:\Users\Admin\AppData\Local\Temp\CAII000080521.exe
"C:\Users\Admin\AppData\Local\Temp\CAII000080521.exe"
1⤵
- Suspicious use of WriteProcessMemory
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious behavior: EnumeratesProcesses
PID:1496

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v firefoxx /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
2⤵
- Suspicious use of WriteProcessMemory
PID:452

C:\Windows\SysWOW64\reg.exe
REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v firefoxx /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
3⤵
- Adds Run entry to start application
PID:1060

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
2⤵
- Suspicious use of WriteProcessMemory
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious behavior: EnumeratesProcesses
- Executes dropped EXE
PID:1692

C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
3⤵
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious behavior: EnumeratesProcesses
- Executes dropped EXE
PID:1868

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

Download Submit
C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe

Download Submit
\Users\Admin\AppData\Local\Temp\RegAsm.exe

Download Submit
\Users\Admin\AppData\Local\Temp\RegAsm.exe

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe

Download Submit
memory/452-3-0x0000000000000000-mapping.dmp

Download
memory/1060-4-0x0000000000000000-mapping.dmp

Download
memory/1496-1-0x0000000000000000-0x0000000000000000-disk.dmp

Download
memory/1692-6-0x0000000000000000-mapping.dmp

Download
memory/1868-14-0x0000000000400000-0x000000000049A000-memory.dmp

Filesize
616KB

Download
memory/1868-15-0x000000000049451E-mapping.dmp

Download
memory/1868-17-0x0000000000400000-0x000000000049A000-memory.dmp

Filesize
616KB

Download
memory/1868-18-0x0000000000400000-0x000000000049A000-memory.dmp

Filesize
616KB

Download

Analysis

Sharing