guloader | c18236bbfdf439b697501aaba8a7f8878902d412e2aa0f23df20161eb500f158

General

Target

NTS_eTaxInvoice 3-2-2023·pdf.exe
Size

332KB
MD5

a8cd6b4bb8c742162581ed1a314cfe9f
SHA1

dfc294e2ff0938e470621cbe35fecbf5eb75c631
SHA256

c18236bbfdf439b697501aaba8a7f8878902d412e2aa0f23df20161eb500f158
SHA512

cfe27e7ec63881b64b431275cd59995850e13f7d9dba99c8f69c34462610805149246c78a30f7c62e9aa3533b8c7e1143f9e9705c1142c416ce07a2baecf5345
SSDEEP

6144:twq3NpWyFr7S0HFwnNHF6KzMw4y7H2C00LUfGAqOolFhNHdKCeebZRueNk8K:tzayFfDwNgoMAz5UfGaMhNQ/6ZRueZK

Score

10^/10

guloader nanocore downloader keylogger persistence spyware stealer trojan

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

masterpat0nms672ns.duckdns.org:3498

Mutex

e277811f-20a3-49b6-ae15-cbb22e96ee2f

Attributes

activate_away_mode
true
backup_connection_host
backup_dns_server
buffer_size
65535
build_time
2022-11-13T22:04:22.529311336Z
bypass_user_account_control
false
bypass_user_account_control_data
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
clear_access_control
true
clear_zone_identifier
false
connect_delay
4000
connection_port
3498
default_group
Default
enable_debug_mode
true
gc_threshold
1.048576e+07
keep_alive_timeout
30000
keyboard_logging
false
lan_timeout
2500
max_packet_size
1.048576e+07
mutex
e277811f-20a3-49b6-ae15-cbb22e96ee2f
mutex_timeout
5000
prevent_system_sleep
false
primary_connection_host
masterpat0nms672ns.duckdns.org
primary_dns_server
masterpat0nms672ns.duckdns.org
request_elevation
true
restart_delay
5000
run_delay
15
run_on_startup
true
set_critical_process
true
timeout_interval
5000
use_custom_dns_server
false
version
1.2.2.0
wan_timeout
8000

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
NanoCore
NanoCore is a remote access tool (RAT) with a variety of capabilities.
keylogger trojan stealer spyware nanocore

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

Processes:

caspol.exeNTS_eTaxInvoice 3-2-2023·pdf.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	caspol.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	NTS_eTaxInvoice 3-2-2023·pdf.exe

Loads dropped DLL 1 IoCs

Processes:

NTS_eTaxInvoice 3-2-2023·pdf.exe

pid process

1708 NTS_eTaxInvoice 3-2-2023·pdf.exe

pid	process
1708	NTS_eTaxInvoice 3-2-2023·pdf.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

caspol.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	caspol.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Startup key = "C:\\Users\\Admin\\AppData\\Local\\Temp\\subfolder1\\Windows.exe"	caspol.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

Processes:

caspol.exe

pid process

952 caspol.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

NTS_eTaxInvoice 3-2-2023·pdf.execaspol.exe

pid process

1708 NTS_eTaxInvoice 3-2-2023·pdf.exe
952 caspol.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

NTS_eTaxInvoice 3-2-2023·pdf.exe

description pid process target process

PID 1708 set thread context of 952 1708 NTS_eTaxInvoice 3-2-2023·pdf.exe caspol.exe
Drops file in Program Files directory 1 IoCs

Processes:

NTS_eTaxInvoice 3-2-2023·pdf.exe

description ioc process

File opened for modification C:\Program Files (x86)\birdbath\Telamon.God NTS_eTaxInvoice 3-2-2023·pdf.exe

pid	process
952	caspol.exe

pid	process
1708	NTS_eTaxInvoice 3-2-2023·pdf.exe
952	caspol.exe

description	pid	process	target process
PID 1708 set thread context of 952	1708	NTS_eTaxInvoice 3-2-2023·pdf.exe	caspol.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\birdbath\Telamon.God	NTS_eTaxInvoice 3-2-2023·pdf.exe

Drops file in Windows directory 2 IoCs

Processes:

NTS_eTaxInvoice 3-2-2023·pdf.exe

description	ioc	process
File opened for modification	C:\Windows\Fonts\Hyperborean\tylostylote.ini	NTS_eTaxInvoice 3-2-2023·pdf.exe
File opened for modification	C:\Windows\resources\0409\Unconfected.Irr	NTS_eTaxInvoice 3-2-2023·pdf.exe

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

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

1028 schtasks.exe
Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

caspol.exe

pid process

952 caspol.exe
952 caspol.exe
952 caspol.exe
952 caspol.exe
952 caspol.exe
952 caspol.exe
952 caspol.exe
952 caspol.exe
952 caspol.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

caspol.exe

pid process

952 caspol.exe
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

NTS_eTaxInvoice 3-2-2023·pdf.exe

pid process

1708 NTS_eTaxInvoice 3-2-2023·pdf.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

caspol.exe

description pid process

Token: SeDebugPrivilege 952 caspol.exe

pid	process
1028	schtasks.exe

pid	process
952	caspol.exe
952	caspol.exe
952	caspol.exe
952	caspol.exe
952	caspol.exe
952	caspol.exe
952	caspol.exe
952	caspol.exe
952	caspol.exe

pid	process
952	caspol.exe

pid	process
1708	NTS_eTaxInvoice 3-2-2023·pdf.exe

description	pid	process
Token: SeDebugPrivilege	952	caspol.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

NTS_eTaxInvoice 3-2-2023·pdf.execaspol.exe

description	pid	process	target process
PID 1708 wrote to memory of 952	1708	NTS_eTaxInvoice 3-2-2023·pdf.exe	caspol.exe
PID 1708 wrote to memory of 952	1708	NTS_eTaxInvoice 3-2-2023·pdf.exe	caspol.exe
PID 1708 wrote to memory of 952	1708	NTS_eTaxInvoice 3-2-2023·pdf.exe	caspol.exe
PID 1708 wrote to memory of 952	1708	NTS_eTaxInvoice 3-2-2023·pdf.exe	caspol.exe
PID 1708 wrote to memory of 952	1708	NTS_eTaxInvoice 3-2-2023·pdf.exe	caspol.exe
PID 952 wrote to memory of 1028	952	caspol.exe	schtasks.exe
PID 952 wrote to memory of 1028	952	caspol.exe	schtasks.exe
PID 952 wrote to memory of 1028	952	caspol.exe	schtasks.exe
PID 952 wrote to memory of 1028	952	caspol.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\NTS_eTaxInvoice 3-2-2023·pdf.exe
"C:\Users\Admin\AppData\Local\Temp\NTS_eTaxInvoice 3-2-2023·pdf.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1708

C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
"C:\Users\Admin\AppData\Local\Temp\NTS_eTaxInvoice 3-2-2023·pdf.exe"
2⤵
- Checks QEMU agent file
- Adds Run key to start application
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:952

C:\Windows\SysWOW64\schtasks.exe
"schtasks.exe" /create /f /tn "DDP Subsystem" /xml "C:\Users\Admin\AppData\Local\Temp\tmpCFC0.tmp"
3⤵
- Creates scheduled task(s)
PID:1028

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

1

T1060

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1

T1102

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpCFC0.tmp
Filesize
1KB

MD5
497f298fc157762f192a7c42854c6fb6

SHA1
04bec630f5cc64ea17c0e3e780b3ccf15a35c6e0

SHA256
3462cbe62fbb64fc53a0fcf97e43baafe9dd9929204f586a86afe4b89d8048a6

SHA512
c7c6fd3097f4d1ccd313160fedf7cb031644e0836b8c3e25481095e5f4b003759bc84fc6ea9421e3a090e66dc2ff875fec2f394a386691ab178cb164733411b2

Download Submit
\Users\Admin\AppData\Local\Temp\nst1097.tmp\System.dll
Filesize
11KB

MD5
17ed1c86bd67e78ade4712be48a7d2bd

SHA1
1cc9fe86d6d6030b4dae45ecddce5907991c01a0

SHA256
bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

SHA512
0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

Download Submit
memory/952-64-0x0000000000A70000-0x0000000001AFF000-memory.dmp

Filesize
16.6MB

Download
memory/952-65-0x00000000772B0000-0x0000000077459000-memory.dmp

Filesize
1.7MB

Download
memory/952-83-0x00000000327A6000-0x00000000327B7000-memory.dmp

Filesize
68KB

Download
memory/952-61-0x0000000000A68A9E-mapping.dmp

Download
memory/952-81-0x00000000732F0000-0x000000007389B000-memory.dmp

Filesize
5.7MB

Download
memory/952-85-0x00000000327A6000-0x00000000327B7000-memory.dmp

Filesize
68KB

Download
memory/952-76-0x0000000000401000-0x0000000000615000-memory.dmp

Filesize
2.1MB

Download
memory/952-84-0x00000000732F0000-0x000000007389B000-memory.dmp

Filesize
5.7MB

Download
memory/952-70-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/952-71-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/952-75-0x0000000000400000-0x0000000000615000-memory.dmp

Filesize
2.1MB

Download
memory/952-78-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/952-74-0x0000000000A70000-0x0000000001AFF000-memory.dmp

Filesize
16.6MB

Download
memory/1028-79-0x0000000000000000-mapping.dmp

Download
memory/1708-60-0x00000000772B0000-0x0000000077459000-memory.dmp

Filesize
1.7MB

Download
memory/1708-72-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/1708-73-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/1708-63-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/1708-54-0x0000000075551000-0x0000000075553000-memory.dmp

Filesize
8KB

Download
memory/1708-82-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/1708-62-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/1708-57-0x0000000003970000-0x00000000049FF000-memory.dmp

Filesize
16.6MB

Download
memory/1708-56-0x0000000003970000-0x00000000049FF000-memory.dmp

Filesize
16.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads