guloader | 412b53f3b10d66cc46c74efda60750eda34c55a5c0866253e15910909142ea34

General

Target

099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe
Size

707KB
MD5

b9a03fb0c2c7f23a1e4ccb0d79c5053c
SHA1

4d87c4ed89d8b92f2b6849dc6af6a8850f8e5e7c
SHA256

099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f
SHA512

7b39c7eb08b12f947a2f5fb79f91a7c8fb738fa14c2539db55f207754438f5b340d5ae5219ec1ea6861cb72aad32e04d2b701cc6a34c098e0a780db3607be3d2
SSDEEP

12288:d35ol8MJEBhQRtZZbhhLSbWJgU8UFJ6UibZP9/I7TAWWtQnm:d3kJEBORt7b3Oa2Udi9P9yTB0Qnm

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Loads dropped DLL 2 IoCs

pid	Process
3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe
3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe
4804	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3376 set thread context of 4804	3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe	92

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\nomarch\gratiales.ini	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Fonts\Gullis.lnk	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe
File opened for modification	C:\Windows\Fonts\Gullis.lnk	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.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	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3376 wrote to memory of 4804	3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe	92
PID 3376 wrote to memory of 4804	3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe	92
PID 3376 wrote to memory of 4804	3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe	92
PID 3376 wrote to memory of 4804	3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe	92
PID 3376 wrote to memory of 4804	3376	099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe	92

C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe
"C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3376
- C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe
  "C:\Users\Admin\AppData\Local\Temp\099369eb025c3e23b6669c872ac2572e7bc4ba9200eb4d6318284983ddb78e3f.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:4804

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\nsa884B.tmp\System.dll

Filesize
11KB

MD5
75ed96254fbf894e42058062b4b4f0d1

SHA1
996503f1383b49021eb3427bc28d13b5bbd11977

SHA256
a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7

SHA512
58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

Download Submit
C:\Windows\Fonts\Gullis.lnk

Filesize
1KB

MD5
ee0b9434686409392ffd83025c921ede

SHA1
903619da806ea5057ad4d4433686d48f6cc374a9

SHA256
7acb67f2e929fbf10b6d346f36a5fc59e22744223db5443376dcd39e67db075c

SHA512
211a38c91c730c47e60e76263e74c2a54e5ef54fa1eef020bd4cd0598afe4cdca62dafa1a368cf4ec7c5e54c6561237912fd853a4e92c96d8698a12c14a4dd1b

Download Submit
memory/3376-18-0x0000000002AC0000-0x00000000059AA000-memory.dmp

Filesize
46.9MB

Download
memory/3376-20-0x0000000077A11000-0x0000000077B31000-memory.dmp

Filesize
1.1MB

Download
memory/3376-19-0x0000000002AC0000-0x00000000059AA000-memory.dmp

Filesize
46.9MB

Download
memory/3376-21-0x0000000074704000-0x0000000074705000-memory.dmp

Filesize
4KB

Download
memory/3376-23-0x0000000002AC0000-0x00000000059AA000-memory.dmp

Filesize
46.9MB

Download
memory/4804-22-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4804-24-0x0000000001660000-0x000000000454A000-memory.dmp

Filesize
46.9MB

Download
memory/4804-25-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4804-26-0x0000000001660000-0x000000000454A000-memory.dmp

Filesize
46.9MB

Download

Analysis

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