guloader | 18bfaa34bea9797ca82ffa02adc900f70ad24ad9663afacf0d963ff41d3a0c17

General

Target

PolysealsSdnBhdStatementReceipts1111.exe
Size

674KB
MD5

3b50d4e4dfbc3dd4616540a5f4a4c77b
SHA1

ecfa344492999e0b58524cd759bd1ea296c80d2f
SHA256

18bfaa34bea9797ca82ffa02adc900f70ad24ad9663afacf0d963ff41d3a0c17
SHA512

4ca6beb0446b074e05d44c9e172a2f31a2ef47ceac83c3d141524160d08e8027d4e6a5a6fdde6eddd31f227353e9e079e77068b2f74b38527d4ae7a30bf0141e
SSDEEP

12288:yYrwHze67C+Szoaz6PhVeYqqGrZqVY/h2guBONyc6SwLIrpwEVNNrygxj1Nj4sl/:yY8Hze6fuoOchVBqqGcVYsK6SaA75TN7

Score

10^/10

guloader discovery downloader persistence upx

Malware Config

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Loads dropped DLL 1 IoCs

pid	Process
4524	PolysealsSdnBhdStatementReceipts1111.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\licensed = "C:\\Users\\Admin\\AppData\\Roaming\\Afsoege\\Bedrooms.exe"	msiexec.exe

Blocklisted process makes network request 29 IoCs

flow	pid	Process
19	2096	msiexec.exe
20	2096	msiexec.exe
22	2096	msiexec.exe
24	2096	msiexec.exe
26	2096	msiexec.exe
27	2096	msiexec.exe
41	2096	msiexec.exe
42	2096	msiexec.exe
43	2096	msiexec.exe
44	2096	msiexec.exe
45	2096	msiexec.exe
46	2096	msiexec.exe
50	2096	msiexec.exe
51	2096	msiexec.exe
52	2096	msiexec.exe
56	2096	msiexec.exe
58	2096	msiexec.exe
59	2096	msiexec.exe
63	2096	msiexec.exe
64	2096	msiexec.exe
65	2096	msiexec.exe
66	2096	msiexec.exe
67	2096	msiexec.exe
68	2096	msiexec.exe
69	2096	msiexec.exe
70	2096	msiexec.exe
71	2096	msiexec.exe
73	2096	msiexec.exe
74	2096	msiexec.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2096	msiexec.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4524	PolysealsSdnBhdStatementReceipts1111.exe
2096	msiexec.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4524 set thread context of 2096	4524	PolysealsSdnBhdStatementReceipts1111.exe	91

UPX packed file 1 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2096-25-0x0000000000400000-0x00000000005E4000-memory.dmp	upx

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Internationalen\warping.ini	PolysealsSdnBhdStatementReceipts1111.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 2 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	PolysealsSdnBhdStatementReceipts1111.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	msiexec.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4524	PolysealsSdnBhdStatementReceipts1111.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2096	msiexec.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4524 wrote to memory of 2096	4524	PolysealsSdnBhdStatementReceipts1111.exe	91
PID 4524 wrote to memory of 2096	4524	PolysealsSdnBhdStatementReceipts1111.exe	91
PID 4524 wrote to memory of 2096	4524	PolysealsSdnBhdStatementReceipts1111.exe	91
PID 4524 wrote to memory of 2096	4524	PolysealsSdnBhdStatementReceipts1111.exe	91
PID 4524 wrote to memory of 2096	4524	PolysealsSdnBhdStatementReceipts1111.exe	91

C:\Users\Admin\AppData\Local\Temp\PolysealsSdnBhdStatementReceipts1111.exe
"C:\Users\Admin\AppData\Local\Temp\PolysealsSdnBhdStatementReceipts1111.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:4524
- C:\Windows\SysWOW64\msiexec.exe
  "C:\Users\Admin\AppData\Local\Temp\PolysealsSdnBhdStatementReceipts1111.exe"
  2⤵
  - Adds Run key to start application
  - Blocklisted process makes network request
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:2096

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsh97DD.tmp\System.dll

Filesize
12KB

MD5
cff85c549d536f651d4fb8387f1976f2

SHA1
d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

SHA256
8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

SHA512
531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

Download Submit
memory/2096-16-0x0000000000EB0000-0x00000000020E0000-memory.dmp

Filesize
18.2MB

Download
memory/2096-17-0x0000000077628000-0x0000000077629000-memory.dmp

Filesize
4KB

Download
memory/2096-18-0x00000000775A1000-0x00000000776C1000-memory.dmp

Filesize
1.1MB

Download
memory/2096-20-0x0000000000EB0000-0x00000000020E0000-memory.dmp

Filesize
18.2MB

Download
memory/2096-24-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/2096-25-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/2096-28-0x00000000775A1000-0x00000000776C1000-memory.dmp

Filesize
1.1MB

Download
memory/4524-12-0x0000000005300000-0x0000000006530000-memory.dmp

Filesize
18.2MB

Download
memory/4524-13-0x00000000775A1000-0x00000000776C1000-memory.dmp

Filesize
1.1MB

Download
memory/4524-14-0x00000000741F5000-0x00000000741F6000-memory.dmp

Filesize
4KB

Download
memory/4524-15-0x0000000005300000-0x0000000006530000-memory.dmp

Filesize
18.2MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads