253de8145c186c3d3ff60304eab1f23f4fdd50eb38a212c94847578226af433c

Analysis

max time kernel
151s
max time network
15s
platform
windows7_x64
resource
win7v20201028
submitted
15-03-2021 23:08

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General

Target

2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe
Size

57KB
MD5

def91e622f9982c57fbf135737169d09
SHA1

323469e58973010b1f382584806f5969bb1bf13e
SHA256

2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414
SHA512

a3c0ffe74f1b32c521b7b659a235aa10a49478f2ed750d656fae580b7ae89b3a42d00535b4bc14336d1d6dbc829b0dc1b32635a7d076178c15372fd6986023bc

Score

8^/10

upx

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

kyyjs.exe

pid process

1976 kyyjs.exe

pid	process
1976	kyyjs.exe

UPX packed file 3 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
\Users\Admin\AppData\Local\Temp\kyyjs.exe	upx
C:\Users\Admin\AppData\Local\Temp\kyyjs.exe	upx
C:\Users\Admin\AppData\Local\Temp\kyyjs.exe	upx

Loads dropped DLL 1 IoCs

Processes:

2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe

pid process

1684 2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1684	2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe

description	pid	process	target process
PID 1684 wrote to memory of 1976	1684	2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe	kyyjs.exe
PID 1684 wrote to memory of 1976	1684	2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe	kyyjs.exe
PID 1684 wrote to memory of 1976	1684	2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe	kyyjs.exe
PID 1684 wrote to memory of 1976	1684	2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe	kyyjs.exe

C:\Users\Admin\AppData\Local\Temp\2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe
"C:\Users\Admin\AppData\Local\Temp\2fd826bdb83c394de8e5c660cb4af4885e071c96db236e80503b3c4ef048b414.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1684

C:\Users\Admin\AppData\Local\Temp\kyyjs.exe
"C:\Users\Admin\AppData\Local\Temp\kyyjs.exe"
2⤵
- Executes dropped EXE
PID:1976

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\kyyjs.exe
MD5
855f10e618678a710c00098c13871493

SHA1
028b0166f7e1ac3b5377628955db5e4a5ecfefb1

SHA256
38a4530547174c3c2f78b42d70d2f449f3bab196fa360c6553a4a469b2990203

SHA512
f64aed53b4d9c2c1582dfafa2094c86acfcd5b5287c6fa844d432b69a1236ab8e98f6a8e1e95d53bb03f9ce0e6acb817f3e41a2f8c4376cf2495a5eef1e5f2eb

Download Submit
C:\Users\Admin\AppData\Local\Temp\kyyjs.exe
MD5
855f10e618678a710c00098c13871493

SHA1
028b0166f7e1ac3b5377628955db5e4a5ecfefb1

SHA256
38a4530547174c3c2f78b42d70d2f449f3bab196fa360c6553a4a469b2990203

SHA512
f64aed53b4d9c2c1582dfafa2094c86acfcd5b5287c6fa844d432b69a1236ab8e98f6a8e1e95d53bb03f9ce0e6acb817f3e41a2f8c4376cf2495a5eef1e5f2eb

Download Submit
\Users\Admin\AppData\Local\Temp\kyyjs.exe
MD5
855f10e618678a710c00098c13871493

SHA1
028b0166f7e1ac3b5377628955db5e4a5ecfefb1

SHA256
38a4530547174c3c2f78b42d70d2f449f3bab196fa360c6553a4a469b2990203

SHA512
f64aed53b4d9c2c1582dfafa2094c86acfcd5b5287c6fa844d432b69a1236ab8e98f6a8e1e95d53bb03f9ce0e6acb817f3e41a2f8c4376cf2495a5eef1e5f2eb

Download Submit
memory/1684-2-0x00000000756A1000-0x00000000756A3000-memory.dmp

Filesize
8KB

Download
memory/1976-4-0x0000000000000000-mapping.dmp

Download