guloader | caf073b1d85bc136488382be2c83c264ac64d2df279752341b1c4601c6201a41

General

Target

chrome.exe
Size

583KB
MD5

42ee1ad3b4600a955888780e8899c1ce
SHA1

4ba8b368c32fa57703613e0c98d90381b872d5ad
SHA256

caf073b1d85bc136488382be2c83c264ac64d2df279752341b1c4601c6201a41
SHA512

42063774445da72a55fd97b8a614275993ac7def057efea876e2bafca5a4560c553a450252157a662364e58734d221632547f1e776d7bd8b600ca4c127c03665
SSDEEP

12288:L5Z+mqofs6TaXML3crUlbIInrHR2Fwn6DijBtpl2i6F+0cfjoop:tUJN9MwrfInrHvnY7ipzoop

Score

10^/10

guloader nanocore downloader keylogger persistence spyware stealer trojan

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

212.87.204.153:6100

Mutex

ea7f103c-d9e6-4f82-9646-8d28f9c28502

Attributes

activate_away_mode
true
backup_connection_host
212.87.204.153
backup_dns_server
8.8.4.4
buffer_size
65535
build_time
2022-12-02T00:16:59.005970036Z
bypass_user_account_control
true
bypass_user_account_control_data
clear_access_control
true
clear_zone_identifier
false
connect_delay
4000
connection_port
6100
default_group
GRACE
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
ea7f103c-d9e6-4f82-9646-8d28f9c28502
mutex_timeout
5000
prevent_system_sleep
false
primary_connection_host
212.87.204.153
primary_dns_server
8.8.8.8
request_elevation
true
restart_delay
5000
run_delay
0
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:

chrome.execaspol.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	chrome.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	caspol.exe

Loads dropped DLL 2 IoCs

Processes:

chrome.exe

pid process

2800 chrome.exe
2800 chrome.exe

pid	process
2800	chrome.exe
2800	chrome.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-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	caspol.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Unfingered = "C:\\Users\\Admin\\AppData\\Roaming\\Bathometres\\Ufordjelighedens.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

1896 caspol.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

chrome.execaspol.exe

pid process

2800 chrome.exe
1896 caspol.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

chrome.exe

description pid process target process

PID 2800 set thread context of 1896 2800 chrome.exe caspol.exe
Drops file in Program Files directory 1 IoCs

Processes:

chrome.exe

description ioc process

File opened for modification C:\Program Files (x86)\Rangforskellene\Eksorcismens\markrposition\Ropewalker.Dam chrome.exe
Drops file in Windows directory 1 IoCs

Processes:

chrome.exe

description ioc process

File opened for modification C:\Windows\Fonts\Diskografierne35\Arles\Satirikeren\Hypophyllium.ten chrome.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

caspol.exe

pid process

1896 caspol.exe
1896 caspol.exe
1896 caspol.exe
1896 caspol.exe
1896 caspol.exe
1896 caspol.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

caspol.exe

pid process

1896 caspol.exe
Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

chrome.exe

pid process

2800 chrome.exe
2800 chrome.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

caspol.exe

description pid process

Token: SeDebugPrivilege 1896 caspol.exe

pid	process
1896	caspol.exe

pid	process
2800	chrome.exe
1896	caspol.exe

description	pid	process	target process
PID 2800 set thread context of 1896	2800	chrome.exe	caspol.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Rangforskellene\Eksorcismens\markrposition\Ropewalker.Dam	chrome.exe

description	ioc	process
File opened for modification	C:\Windows\Fonts\Diskografierne35\Arles\Satirikeren\Hypophyllium.ten	chrome.exe

pid	process
1896	caspol.exe
1896	caspol.exe
1896	caspol.exe
1896	caspol.exe
1896	caspol.exe
1896	caspol.exe

pid	process
1896	caspol.exe

pid	process
2800	chrome.exe
2800	chrome.exe

description	pid	process
Token: SeDebugPrivilege	1896	caspol.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

chrome.exe

description	pid	process	target process
PID 2800 wrote to memory of 4460	2800	chrome.exe	caspol.exe
PID 2800 wrote to memory of 4460	2800	chrome.exe	caspol.exe
PID 2800 wrote to memory of 4460	2800	chrome.exe	caspol.exe
PID 2800 wrote to memory of 1896	2800	chrome.exe	caspol.exe
PID 2800 wrote to memory of 1896	2800	chrome.exe	caspol.exe
PID 2800 wrote to memory of 1896	2800	chrome.exe	caspol.exe
PID 2800 wrote to memory of 1896	2800	chrome.exe	caspol.exe

C:\Users\Admin\AppData\Local\Temp\chrome.exe
"C:\Users\Admin\AppData\Local\Temp\chrome.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:2800

C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
"C:\Users\Admin\AppData\Local\Temp\chrome.exe"
2⤵
PID:4460

C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
"C:\Users\Admin\AppData\Local\Temp\chrome.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
PID:1896

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

Web Service

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nst6AC7.tmp\System.dll

Filesize
11KB

MD5
9625d5b1754bc4ff29281d415d27a0fd

SHA1
80e85afc5cccd4c0a3775edbb90595a1a59f5ce0

SHA256
c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448

SHA512
dce52b640897c2e8dbfd0a1472d5377fa91fb9cf1aeff62604d014bccbe5b56af1378f173132abeb0edd18c225b9f8f5e3d3e72434aed946661e036c779f165b

Download Submit
C:\Users\Admin\AppData\Local\Temp\nst6AC7.tmp\System.dll

Filesize
11KB

MD5
9625d5b1754bc4ff29281d415d27a0fd

SHA1
80e85afc5cccd4c0a3775edbb90595a1a59f5ce0

SHA256
c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448

SHA512
dce52b640897c2e8dbfd0a1472d5377fa91fb9cf1aeff62604d014bccbe5b56af1378f173132abeb0edd18c225b9f8f5e3d3e72434aed946661e036c779f165b

Download Submit
memory/1896-148-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1896-141-0x0000000000B90000-0x000000000621E000-memory.dmp

Filesize
86.6MB

Download
memory/1896-153-0x0000000072620000-0x0000000072BD1000-memory.dmp

Filesize
5.7MB

Download
memory/1896-152-0x0000000077030000-0x00000000771D3000-memory.dmp

Filesize
1.6MB

Download
memory/1896-138-0x0000000000000000-mapping.dmp

Download
memory/1896-151-0x0000000077030000-0x00000000771D3000-memory.dmp

Filesize
1.6MB

Download
memory/1896-140-0x0000000000B90000-0x000000000621E000-memory.dmp

Filesize
86.6MB

Download
memory/1896-149-0x0000000072620000-0x0000000072BD1000-memory.dmp

Filesize
5.7MB

Download
memory/1896-142-0x00007FFC32AD0000-0x00007FFC32CC5000-memory.dmp

Filesize
2.0MB

Download
memory/1896-143-0x0000000077030000-0x00000000771D3000-memory.dmp

Filesize
1.6MB

Download
memory/1896-144-0x0000000077030000-0x00000000771D3000-memory.dmp

Filesize
1.6MB

Download
memory/1896-145-0x0000000000400000-0x000000000062B000-memory.dmp

Filesize
2.2MB

Download
memory/1896-146-0x0000000000401000-0x000000000062B000-memory.dmp

Filesize
2.2MB

Download
memory/1896-150-0x00007FFC32AD0000-0x00007FFC32CC5000-memory.dmp

Filesize
2.0MB

Download
memory/2800-139-0x0000000077030000-0x00000000771D3000-memory.dmp

Filesize
1.6MB

Download
memory/2800-134-0x00000000049B0000-0x000000000A03E000-memory.dmp

Filesize
86.6MB

Download
memory/2800-135-0x00000000049B0000-0x000000000A03E000-memory.dmp

Filesize
86.6MB

Download
memory/2800-137-0x0000000077030000-0x00000000771D3000-memory.dmp

Filesize
1.6MB

Download
memory/2800-136-0x00007FFC32AD0000-0x00007FFC32CC5000-memory.dmp

Filesize
2.0MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads