guloader | 6bc169f4ce1c914bce0a10681748f1e5a1faeb8cd5257bdd0340bee2ede6335b

General

Target

a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
Size

555KB
MD5

18ea5087eb82e075ca35d2b2dcff9450
SHA1

dc436fbaa777672d44a8b90b98c4a1c266885845
SHA256

a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725
SHA512

8fbeb3caf13a3fe1359002c2848ff5767e6b2f226049546c683f2b6144756196cfe39f66e4959c8426cdfaeff6a169a4cf5939de241e4a898887d8810ec620c6
SSDEEP

12288:32EIiN/Z1++w1p+wJuQbIgJwCQBk5wBcamd3ZhZs:3wiN/K+wHBfhQBk5s3mdPZs

Score

10^/10

guloader xworm discovery downloader execution rat trojan

Malware Config

Extracted

Family

xworm

Version

3.1

C2

87.121.86.8:4020

Mutex

ssjpS2lhbkGsnEgT

Attributes

Install_directory
%AppData%
install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2880-16-0x00000000007E0000-0x00000000007F0000-memory.dmp	family_xworm

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
812	powershell.exe
1060	powershell.exe
1136	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.lnk	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.lnk	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

Loads dropped DLL 2 IoCs

pid	Process
2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2152 set thread context of 2880	2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	30

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\slnger\barometerstandenes.san	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
812	powershell.exe
1060	powershell.exe
1136	powershell.exe
2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
Token: SeDebugPrivilege	812	powershell.exe
Token: SeDebugPrivilege	1060	powershell.exe
Token: SeDebugPrivilege	1136	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2152 wrote to memory of 2880	2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	30
PID 2152 wrote to memory of 2880	2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	30
PID 2152 wrote to memory of 2880	2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	30
PID 2152 wrote to memory of 2880	2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	30
PID 2152 wrote to memory of 2880	2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	30
PID 2152 wrote to memory of 2880	2152	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	30
PID 2880 wrote to memory of 812	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	32
PID 2880 wrote to memory of 812	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	32
PID 2880 wrote to memory of 812	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	32
PID 2880 wrote to memory of 812	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	32
PID 2880 wrote to memory of 1060	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	34
PID 2880 wrote to memory of 1060	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	34
PID 2880 wrote to memory of 1060	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	34
PID 2880 wrote to memory of 1060	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	34
PID 2880 wrote to memory of 1136	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	36
PID 2880 wrote to memory of 1136	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	36
PID 2880 wrote to memory of 1136	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	36
PID 2880 wrote to memory of 1136	2880	a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe	36

C:\Users\Admin\AppData\Local\Temp\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
"C:\Users\Admin\AppData\Local\Temp\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2152
- C:\Users\Admin\AppData\Local\Temp\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe
  "C:\Users\Admin\AppData\Local\Temp\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe"
  2⤵
  - Drops startup file
  - Loads dropped DLL
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2880
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:812
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1060
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1136

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

Filesize
7KB

MD5
13b6194fa3d9e144f58af884e0cf8c7d

SHA1
73fe56940961144624193c15cb6e0210fe7b36a9

SHA256
190306fa601f410e0c7ef63124409465a7597f2929ff2392e19ea2a3b05b4b23

SHA512
e6a967bed9c6630411e54212b3f55661c047ed7dbb52a0d4a4d0705899cd9760272e618c06f0f45128e62410e1cbc7da1a270f7e9edc3daca3390b63b317e4ff

Download Submit
\Users\Admin\AppData\Local\Temp\nsj94B2.tmp\System.dll

Filesize
11KB

MD5
75ed96254fbf894e42058062b4b4f0d1

SHA1
996503f1383b49021eb3427bc28d13b5bbd11977

SHA256
a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7

SHA512
58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

Download Submit
\Users\Admin\AppData\Roaming\a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725.exe

Filesize
555KB

MD5
18ea5087eb82e075ca35d2b2dcff9450

SHA1
dc436fbaa777672d44a8b90b98c4a1c266885845

SHA256
a7247c64cc0168290ca3b210e59ef629b46f513205bc6562ec79cdd2cda71725

SHA512
8fbeb3caf13a3fe1359002c2848ff5767e6b2f226049546c683f2b6144756196cfe39f66e4959c8426cdfaeff6a169a4cf5939de241e4a898887d8810ec620c6

Download Submit
memory/2152-9-0x0000000002A70000-0x0000000004FA9000-memory.dmp

Filesize
37.2MB

Download
memory/2152-10-0x0000000002A70000-0x0000000004FA9000-memory.dmp

Filesize
37.2MB

Download
memory/2152-11-0x0000000077BE1000-0x0000000077CE2000-memory.dmp

Filesize
1.0MB

Download
memory/2152-12-0x0000000077BE0000-0x0000000077D89000-memory.dmp

Filesize
1.7MB

Download
memory/2152-14-0x0000000002A70000-0x0000000004FA9000-memory.dmp

Filesize
37.2MB

Download
memory/2880-13-0x0000000077BE0000-0x0000000077D89000-memory.dmp

Filesize
1.7MB

Download
memory/2880-15-0x00000000007E0000-0x0000000001842000-memory.dmp

Filesize
16.4MB

Download
memory/2880-16-0x00000000007E0000-0x00000000007F0000-memory.dmp

Filesize
64KB

Download

Analysis

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