guloader | c631b3586ae88b9952c7541fbc6d490f9906b870fc12397a8c7bb84e07eab6cd

General

Target

NEW PO.exe
Size

619KB
MD5

f04045696fc138e5b37ce3a614b009dd
SHA1

90ad0d42c91f1e63cd241269a74c2b2bcb7f785b
SHA256

c631b3586ae88b9952c7541fbc6d490f9906b870fc12397a8c7bb84e07eab6cd
SHA512

35befc8000afdc23a5d343afc538b5848ae57466f13364c98e1d75a9d9b67852a76c56c203ee3ded606d4e6b81b70ef8a374ea982b309bcc229627ade298fc6e
SSDEEP

12288:2iuvt+JET0nPj/w7XUJRRsZsnpuCVEMdwal42220w71k6MIFSwnOXafXTvqoo6qy:iV+JEwnPj/w7astCVep2upWrdTb6y

Score

10^/10

guloader xworm discovery downloader rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

135.148.3.78:7001

Mutex

Nq3DhFaRdPbxvgCQ

Attributes

install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/4772-47-0x0000000000470000-0x000000000047E000-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

Loads dropped DLL 2 IoCs

pid	Process
4820	NEW PO.exe
4820	NEW PO.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
33	drive.google.com
34	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4772	NEW PO.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4820	NEW PO.exe
4772	NEW PO.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	NEW PO.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	NEW PO.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4820	NEW PO.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4772	NEW PO.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4820 wrote to memory of 4772	4820	NEW PO.exe	97
PID 4820 wrote to memory of 4772	4820	NEW PO.exe	97
PID 4820 wrote to memory of 4772	4820	NEW PO.exe	97
PID 4820 wrote to memory of 4772	4820	NEW PO.exe	97

C:\Users\Admin\AppData\Local\Temp\NEW PO.exe
"C:\Users\Admin\AppData\Local\Temp\NEW PO.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4820
- C:\Users\Admin\AppData\Local\Temp\NEW PO.exe
  "C:\Users\Admin\AppData\Local\Temp\NEW PO.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:4772

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nso832C.tmp\System.dll

Filesize
11KB

MD5
be2621a78a13a56cf09e00dd98488360

SHA1
75f0539dc6af200a07cdb056cddddec595c6cfd2

SHA256
852047023ba0cae91c7a43365878613cfb4e64e36ff98c460e113d5088d68ef5

SHA512
b80cf1f678e6885276b9a1bfd9227374b2eb9e38bb20446d52ebe2c3dba89764aa50cb4d49df51a974478f3364b5dbcbc5b4a16dc8f1123b40c89c01725be3d1

Download Submit
memory/4772-46-0x00000000721BE000-0x00000000721BF000-memory.dmp

Filesize
4KB

Download
memory/4772-49-0x00000000721B0000-0x0000000072960000-memory.dmp

Filesize
7.7MB

Download
memory/4772-57-0x0000000039EB0000-0x0000000039EBC000-memory.dmp

Filesize
48KB

Download
memory/4772-27-0x00000000016D0000-0x0000000007106000-memory.dmp

Filesize
90.2MB

Download
memory/4772-28-0x0000000077348000-0x0000000077349000-memory.dmp

Filesize
4KB

Download
memory/4772-29-0x0000000077365000-0x0000000077366000-memory.dmp

Filesize
4KB

Download
memory/4772-42-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/4772-44-0x00000000772C1000-0x00000000773E1000-memory.dmp

Filesize
1.1MB

Download
memory/4772-56-0x000000003A980000-0x000000003AF24000-memory.dmp

Filesize
5.6MB

Download
memory/4772-55-0x000000003A8E0000-0x000000003A972000-memory.dmp

Filesize
584KB

Download
memory/4772-45-0x00000000016D0000-0x0000000007106000-memory.dmp

Filesize
90.2MB

Download
memory/4772-48-0x0000000039E10000-0x0000000039EAC000-memory.dmp

Filesize
624KB

Download
memory/4772-47-0x0000000000470000-0x000000000047E000-memory.dmp

Filesize
56KB

Download
memory/4772-43-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/4772-51-0x00000000721BE000-0x00000000721BF000-memory.dmp

Filesize
4KB

Download
memory/4772-52-0x0000000037A90000-0x0000000037AF6000-memory.dmp

Filesize
408KB

Download
memory/4772-53-0x00000000721B0000-0x0000000072960000-memory.dmp

Filesize
7.7MB

Download
memory/4820-26-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/4820-24-0x00000000772C1000-0x00000000773E1000-memory.dmp

Filesize
1.1MB

Download
memory/4820-25-0x00000000772C1000-0x00000000773E1000-memory.dmp

Filesize
1.1MB

Download

Analysis

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