guloader | 0d73ed2420afde35f1e9687c44c5fe9531be28e6c2fad944dc416014012dfd9e

General

Target

526231515215api2535forms.exe
Size

1002KB
MD5

eda4d61a350236937e265ed2c2e2e666
SHA1

382707fd6300a57d955da0c5333f41eb12d67073
SHA256

2eade1e13548c453abaf7f320aa91034d849c2adbba8ddced41fccb27d8cde1c
SHA512

941a99ce65f667f8588e9c9ed2116567b08db2b9c64927e1cf13579b4ac14f19eae40c350df0f46a43a372946ac6bb3a6841873f37a8909bac73caafc42e3658
SSDEEP

24576:QN5CyziiwG6B/8ZKDCOQhoRg8mhUsiNj+AoxCUYMN+QQLZ:w5CAi3G6B/8EXRgriIAoLNZQ1

Score

10^/10

guloader xworm discovery downloader rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

87.121.86.171:7756

Mutex

dvJVokD5QYSVhziW

Attributes

install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/1280-43-0x00000000004A0000-0x00000000004B0000-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 1 IoCs

pid	Process
1784	526231515215api2535forms.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1280	526231515215api2535forms.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1784	526231515215api2535forms.exe
1280	526231515215api2535forms.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	526231515215api2535forms.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	526231515215api2535forms.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1280	526231515215api2535forms.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1784	526231515215api2535forms.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1280	526231515215api2535forms.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1280	526231515215api2535forms.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1784 wrote to memory of 1280	1784	526231515215api2535forms.exe	89
PID 1784 wrote to memory of 1280	1784	526231515215api2535forms.exe	89
PID 1784 wrote to memory of 1280	1784	526231515215api2535forms.exe	89
PID 1784 wrote to memory of 1280	1784	526231515215api2535forms.exe	89

C:\Users\Admin\AppData\Local\Temp\526231515215api2535forms.exe
"C:\Users\Admin\AppData\Local\Temp\526231515215api2535forms.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1784
- C:\Users\Admin\AppData\Local\Temp\526231515215api2535forms.exe
  "C:\Users\Admin\AppData\Local\Temp\526231515215api2535forms.exe"
  2⤵
  - 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
  PID:1280

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

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsp789C.tmp\System.dll

Filesize
12KB

MD5
cff85c549d536f651d4fb8387f1976f2

SHA1
d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

SHA256
8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

SHA512
531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

Download Submit
C:\Users\Admin\AppData\Roaming\Cryptoheretic\Forlange.exe

Filesize
1002KB

MD5
eda4d61a350236937e265ed2c2e2e666

SHA1
382707fd6300a57d955da0c5333f41eb12d67073

SHA256
2eade1e13548c453abaf7f320aa91034d849c2adbba8ddced41fccb27d8cde1c

SHA512
941a99ce65f667f8588e9c9ed2116567b08db2b9c64927e1cf13579b4ac14f19eae40c350df0f46a43a372946ac6bb3a6841873f37a8909bac73caafc42e3658

Download Submit
memory/1280-41-0x0000000001700000-0x00000000054A3000-memory.dmp

Filesize
61.6MB

Download
memory/1280-47-0x0000000071DE0000-0x0000000072590000-memory.dmp

Filesize
7.7MB

Download
memory/1280-28-0x0000000001700000-0x00000000054A3000-memory.dmp

Filesize
61.6MB

Download
memory/1280-29-0x0000000076F78000-0x0000000076F79000-memory.dmp

Filesize
4KB

Download
memory/1280-30-0x0000000076EF1000-0x0000000077011000-memory.dmp

Filesize
1.1MB

Download
memory/1280-52-0x0000000071DE0000-0x0000000072590000-memory.dmp

Filesize
7.7MB

Download
memory/1280-39-0x00000000004A0000-0x00000000016F4000-memory.dmp

Filesize
18.3MB

Download
memory/1280-42-0x0000000071DEE000-0x0000000071DEF000-memory.dmp

Filesize
4KB

Download
memory/1280-51-0x0000000071DEE000-0x0000000071DEF000-memory.dmp

Filesize
4KB

Download
memory/1280-43-0x00000000004A0000-0x00000000004B0000-memory.dmp

Filesize
64KB

Download
memory/1280-44-0x0000000038240000-0x00000000382DC000-memory.dmp

Filesize
624KB

Download
memory/1280-45-0x0000000038760000-0x0000000038D04000-memory.dmp

Filesize
5.6MB

Download
memory/1280-46-0x0000000038F10000-0x0000000038FA2000-memory.dmp

Filesize
584KB

Download
memory/1280-49-0x0000000038FB0000-0x0000000039016000-memory.dmp

Filesize
408KB

Download
memory/1280-48-0x0000000038530000-0x000000003853A000-memory.dmp

Filesize
40KB

Download
memory/1784-26-0x0000000076EF1000-0x0000000077011000-memory.dmp

Filesize
1.1MB

Download
memory/1784-25-0x0000000076EF1000-0x0000000077011000-memory.dmp

Filesize
1.1MB

Download
memory/1784-27-0x0000000073BE5000-0x0000000073BE6000-memory.dmp

Filesize
4KB

Download

Analysis

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