guloader | d2a7db4b5d96370d8693b3e204af84f3b607ccd744b204e1a3321e007d9ab8c4

Analysis

max time kernel
148s
max time network
152s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
submitted
12/10/2023, 13:53

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General

Target

rSkeledes.exe
Size

503KB
MD5

ea1d99e95c51be095f8271952b26acb8
SHA1

1172ff4e5d077d79f47f81f1e4ec3288ec608799
SHA256

d2a7db4b5d96370d8693b3e204af84f3b607ccd744b204e1a3321e007d9ab8c4
SHA512

42f57e99a0a2a534b7c1ca89515c43212ab2c7df394f03186b526a4d3ec78385af502692cfbe631ecd984175232d9a6e13bc4e893ad0abee65434e9abb9c1bdd
SSDEEP

12288:6wc+rgbIhKjQfDDPURqqwYb7csVLuKOEy41cdgev+AVRUj0DgUDsR:6WrgbIwQfDwRq9Yb7cQdb1cGlGR4y0

Score

10^/10

guloader downloader

Malware Config

Signatures

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

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	rSkeledes.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	rSkeledes.exe

Loads dropped DLL 1 IoCs

pid	Process
1856	rSkeledes.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1856	rSkeledes.exe
2772	rSkeledes.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1856 set thread context of 2772	1856	rSkeledes.exe	28

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1856	rSkeledes.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1856 wrote to memory of 2772	1856	rSkeledes.exe	28
PID 1856 wrote to memory of 2772	1856	rSkeledes.exe	28
PID 1856 wrote to memory of 2772	1856	rSkeledes.exe	28
PID 1856 wrote to memory of 2772	1856	rSkeledes.exe	28
PID 1856 wrote to memory of 2772	1856	rSkeledes.exe	28
PID 1856 wrote to memory of 2772	1856	rSkeledes.exe	28

C:\Users\Admin\AppData\Local\Temp\rSkeledes.exe
"C:\Users\Admin\AppData\Local\Temp\rSkeledes.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1856
- C:\Users\Admin\AppData\Local\Temp\rSkeledes.exe
  "C:\Users\Admin\AppData\Local\Temp\rSkeledes.exe"
  2⤵
  - Checks QEMU agent file
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:2772

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nsi4625.tmp\System.dll

Filesize
11KB

MD5
b0c77267f13b2f87c084fd86ef51ccfc

SHA1
f7543f9e9b4f04386dfbf33c38cbed1bf205afb3

SHA256
a0cac4cf4852895619bc7743ebeb89f9e4927ccdb9e66b1bcd92a4136d0f9c77

SHA512
f2b57a2eea00f52a3c7080f4b5f2bb85a7a9b9f16d12da8f8ff673824556c62a0f742b72be0fd82a2612a4b6dbd7e0fdc27065212da703c2f7e28d199696f66e

Download Submit
memory/1856-11-0x0000000003780000-0x00000000041C4000-memory.dmp

Filesize
10.3MB

Download
memory/1856-12-0x0000000003780000-0x00000000041C4000-memory.dmp

Filesize
10.3MB

Download
memory/1856-13-0x0000000077520000-0x00000000776C9000-memory.dmp

Filesize
1.7MB

Download
memory/1856-14-0x0000000077710000-0x00000000777E6000-memory.dmp

Filesize
856KB

Download
memory/1856-15-0x0000000074D30000-0x0000000074D36000-memory.dmp

Filesize
24KB

Download
memory/2772-16-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2772-17-0x0000000001470000-0x0000000001EB4000-memory.dmp

Filesize
10.3MB

Download
memory/2772-18-0x0000000077520000-0x00000000776C9000-memory.dmp

Filesize
1.7MB

Download
memory/2772-19-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2772-20-0x0000000001470000-0x0000000001EB4000-memory.dmp

Filesize
10.3MB

Download
memory/2772-39-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download