Malware Analysis Report

2024-09-11 14:09

Sample ID 240614-qzkejswgrk
Target Solara.exe
SHA256 c5b9eb92ad9b423a53230cf814d2ab1ede0050d0e82a3db566a729804f48f1f7
Tags
evasion xworm persistence rat trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

c5b9eb92ad9b423a53230cf814d2ab1ede0050d0e82a3db566a729804f48f1f7

Threat Level: Known bad

The file Solara.exe was found to be: Known bad.

Malicious Activity Summary

evasion xworm persistence rat trojan

Detect Xworm Payload

Xworm

Looks for VirtualBox Guest Additions in registry

Looks for VMWare Tools registry key

Checks computer location settings

Executes dropped EXE

Checks BIOS information in registry

Maps connected drives based on registry

Adds Run key to start application

Legitimate hosting services abused for malware hosting/C2

Enumerates physical storage devices

Unsigned PE

Uses Task Scheduler COM API

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Creates scheduled task(s)

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Scheduled Task/Job
T1053
Persistence
TA0003
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Scheduled Task/Job
T1053
Privilege Escalation
TA0004
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Scheduled Task/Job
T1053
Defense Evasion
TA0005
Virtualization/Sandbox Evasion
T1497
Modify Registry
T1112
Credential Access
TA0006
Discovery
TA0007
Query Registry
T1012
Virtualization/Sandbox Evasion
T1497
System Information Discovery
T1082
Peripheral Device Discovery
T1120
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Web Service
T1102
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-14 13:41

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-14 13:41

Reported

2024-06-14 13:44

Platform

win7-20240508-en

Max time kernel

120s

Max time network

121s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Solara.exe"

Signatures

Looks for VirtualBox Guest Additions in registry

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A

Looks for VMWare Tools registry key

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A

Maps connected drives based on registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A
Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0 C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A

Processes

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

"C:\Users\Admin\AppData\Local\Temp\Solara.exe"

Network

N/A

Files

memory/2480-0-0x000007FEF5E23000-0x000007FEF5E24000-memory.dmp

memory/2480-1-0x00000000011A0000-0x00000000011BE000-memory.dmp

memory/2480-2-0x0000000000150000-0x0000000000162000-memory.dmp

memory/2480-3-0x000007FEF5E20000-0x000007FEF680C000-memory.dmp

memory/2480-4-0x000007FEF5E23000-0x000007FEF5E24000-memory.dmp

memory/2480-5-0x000007FEF5E20000-0x000007FEF680C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-14 13:41

Reported

2024-06-14 13:42

Platform

win10v2004-20240508-en

Max time kernel

39s

Max time network

42s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Solara.exe"

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Xworm

trojan rat xworm

Looks for VirtualBox Guest Additions in registry

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A

Looks for VMWare Tools registry key

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Roaming\XClient.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\XClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe" C:\Users\Admin\AppData\Roaming\XClient.exe N/A

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A raw.githubusercontent.com N/A N/A

Maps connected drives based on registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A
Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0 C:\Users\Admin\AppData\Local\Temp\Solara.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\XClient.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3712 wrote to memory of 3016 N/A C:\Users\Admin\AppData\Local\Temp\Solara.exe C:\Users\Admin\AppData\Roaming\XClient.exe
PID 3712 wrote to memory of 3016 N/A C:\Users\Admin\AppData\Local\Temp\Solara.exe C:\Users\Admin\AppData\Roaming\XClient.exe
PID 3712 wrote to memory of 1404 N/A C:\Users\Admin\AppData\Local\Temp\Solara.exe C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe
PID 3712 wrote to memory of 1404 N/A C:\Users\Admin\AppData\Local\Temp\Solara.exe C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe
PID 3712 wrote to memory of 1404 N/A C:\Users\Admin\AppData\Local\Temp\Solara.exe C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe
PID 3016 wrote to memory of 1248 N/A C:\Users\Admin\AppData\Roaming\XClient.exe C:\Windows\System32\schtasks.exe
PID 3016 wrote to memory of 1248 N/A C:\Users\Admin\AppData\Roaming\XClient.exe C:\Windows\System32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

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

"C:\Users\Admin\AppData\Local\Temp\Solara.exe"

C:\Users\Admin\AppData\Roaming\XClient.exe

"C:\Users\Admin\AppData\Roaming\XClient.exe"

C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe

"C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe"

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\AppData\Roaming\XClient.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 github.com udp
US 8.8.8.8:53 added-counters.gl.at.ply.gg udp
US 8.8.8.8:53 raw.githubusercontent.com udp
US 8.8.8.8:53 github.com udp
US 8.8.8.8:53 added-counters.gl.at.ply.gg udp

Files

memory/3712-0-0x00000000006C0000-0x00000000006DE000-memory.dmp

memory/3712-1-0x00007FF917AA3000-0x00007FF917AA5000-memory.dmp

memory/3712-2-0x0000000000C90000-0x0000000000CA2000-memory.dmp

memory/3712-3-0x00007FF917AA0000-0x00007FF918561000-memory.dmp

C:\Users\Admin\AppData\Roaming\XClient.exe

MD5 6020ee0728a268d7d79cbfa2633f18cc
SHA1 f047ed26781489cade9dc43eb7034a69ae30c103
SHA256 f2a20f071c27d0f20775ff0663845c263e191f5e3c6a698f1f04d53fed485340
SHA512 67f839a145122a7e08624a656af95fd80c237da41356eecef0eac05417639296cd6f7dfc2e7e11e94a40c1be3611a0550d2492e20715edefd2a3e7d3c5133ef0

C:\Users\Admin\AppData\Roaming\SolaraBootstrapper.exe

MD5 6557bd5240397f026e675afb78544a26
SHA1 839e683bf68703d373b6eac246f19386bb181713
SHA256 a7fecfc225dfdd4e14dcd4d1b4ba1b9f8e4d1984f1cdd8cda3a9987e5d53c239
SHA512 f2399d34898a4c0c201372d2dd084ee66a66a1c3eae949e568421fe7edada697468ef81f4fcab2afd61eaf97bcb98d6ade2d97295e2f674e93116d142e892e97

memory/3016-26-0x00000000004D0000-0x00000000004E0000-memory.dmp

memory/3016-27-0x00007FF917AA0000-0x00007FF918561000-memory.dmp

memory/3712-28-0x00007FF917AA0000-0x00007FF918561000-memory.dmp

memory/1404-30-0x00000000751EE000-0x00000000751EF000-memory.dmp

memory/1404-31-0x0000000000500000-0x000000000050A000-memory.dmp

memory/1404-32-0x00000000028E0000-0x00000000028EA000-memory.dmp

memory/3016-33-0x000000001B180000-0x000000001B190000-memory.dmp

memory/3016-34-0x00007FF917AA0000-0x00007FF918561000-memory.dmp

memory/3016-36-0x000000001B180000-0x000000001B190000-memory.dmp