guloader | 395680070dcbb2686d2cee57bbc034ec5ddbc4a73d595e9152478cbf3dde7abc

Analysis

max time kernel
150s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
22-05-2023 05:52

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General

Target

SO97600676004_KOREA87004707.exe
Size

366KB
MD5

e68d535cd07bc83b74f159c3d32550c8
SHA1

bf308f95dfd870576e6d50609ee902ad2233a81a
SHA256

395680070dcbb2686d2cee57bbc034ec5ddbc4a73d595e9152478cbf3dde7abc
SHA512

a3df967d230089d0035c1be1de518056b4833ebfc755860402974c5569819980d4fe0af96a56a61f5c918e09b023d7887a2859df0c240a616976f44c0173bf71
SSDEEP

6144:ap+gg4S4uYl9skCX32EiDPtxVTUlkypCElSLahELRpbxuOrkBpKgbbrs:2PSVzGE8txVT4pmO2LRpb/Q/

Score

10^/10

guloader discovery 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	SO97600676004_KOREA87004707.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	SO97600676004_KOREA87004707.exe

Loads dropped DLL 2 IoCs

pid	Process
1112	SO97600676004_KOREA87004707.exe
1112	SO97600676004_KOREA87004707.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

pid	Process
532	SO97600676004_KOREA87004707.exe
532	SO97600676004_KOREA87004707.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1112	SO97600676004_KOREA87004707.exe
532	SO97600676004_KOREA87004707.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1112 set thread context of 532	1112	SO97600676004_KOREA87004707.exe	90

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Fonts\Unikums\Ventekjolers\Stampninger\Unrepealable.ini	SO97600676004_KOREA87004707.exe

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
1112	SO97600676004_KOREA87004707.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1112 wrote to memory of 532	1112	SO97600676004_KOREA87004707.exe	90
PID 1112 wrote to memory of 532	1112	SO97600676004_KOREA87004707.exe	90
PID 1112 wrote to memory of 532	1112	SO97600676004_KOREA87004707.exe	90
PID 1112 wrote to memory of 532	1112	SO97600676004_KOREA87004707.exe	90

C:\Users\Admin\AppData\Local\Temp\SO97600676004_KOREA87004707.exe
"C:\Users\Admin\AppData\Local\Temp\SO97600676004_KOREA87004707.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1112
- C:\Users\Admin\AppData\Local\Temp\SO97600676004_KOREA87004707.exe
  "C:\Users\Admin\AppData\Local\Temp\SO97600676004_KOREA87004707.exe"
  2⤵
  - Checks QEMU agent file
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:532

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nse85A2.tmp\System.dll

Filesize
11KB

MD5
75ed96254fbf894e42058062b4b4f0d1

SHA1
996503f1383b49021eb3427bc28d13b5bbd11977

SHA256
a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7

SHA512
58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nse85A2.tmp\System.dll

Filesize
11KB

MD5
75ed96254fbf894e42058062b4b4f0d1

SHA1
996503f1383b49021eb3427bc28d13b5bbd11977

SHA256
a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7

SHA512
58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nse85A2.tmp\System.dll

Filesize
11KB

MD5
75ed96254fbf894e42058062b4b4f0d1

SHA1
996503f1383b49021eb3427bc28d13b5bbd11977

SHA256
a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7

SHA512
58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

Download Submit
memory/532-149-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/532-150-0x0000000001660000-0x0000000004238000-memory.dmp

Filesize
43.8MB

Download
memory/532-151-0x0000000001660000-0x0000000004238000-memory.dmp

Filesize
43.8MB

Download
memory/532-152-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/532-153-0x0000000001660000-0x0000000004238000-memory.dmp

Filesize
43.8MB

Download
memory/532-155-0x0000000001660000-0x0000000004238000-memory.dmp

Filesize
43.8MB

Download
memory/1112-147-0x0000000003310000-0x0000000005EE8000-memory.dmp

Filesize
43.8MB

Download
memory/1112-148-0x0000000003310000-0x0000000005EE8000-memory.dmp

Filesize
43.8MB

Download