20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f

General

Target

20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe
Size

160KB
MD5

1e6391be5e36af6623bed1899bf420b6
SHA1

87dbfd001d7b059f29de7bb3b33793148725e925
SHA256

20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f
SHA512

63bdd925fd8af8d38912f652b5e40ab4c86e417361e33e8d7c370159f7a28b9f216cd7ba74100606f3c586345f287b2399b17c1821312dd8f7bab2b17ceed8c8
SSDEEP

1536:kVdmQr3Z5IfQmv81aypP1s3yX+tlehTz5:008JOfQm01F9s3yX+fehTt

Score

9^/10

evasion upx

Malware Config

Signatures

Detects Windows executables referencing non-Windows User-Agents 4 IoCs

resource	yara_rule
behavioral1/memory/2340-0-0x0000000000400000-0x0000000000428000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/files/0x000c000000012258-3.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/2340-5-0x0000000000400000-0x0000000000428000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/1996-6-0x0000000000400000-0x0000000000428000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral1/memory/2340-0-0x0000000000400000-0x0000000000428000-memory.dmp	UPX
behavioral1/files/0x000c000000012258-3.dat	UPX
behavioral1/memory/2340-5-0x0000000000400000-0x0000000000428000-memory.dmp	UPX
behavioral1/memory/1996-6-0x0000000000400000-0x0000000000428000-memory.dmp	UPX

Sets file to hidden 1 TTPs 1 IoCs

Modifies file attributes to stop it showing in Explorer etc.

evasion

Hidden Files and Directories

T1564.001

pid	Process
2868	attrib.exe

Deletes itself 1 IoCs

pid	Process
2688	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
1996	zskhost.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2340-0-0x0000000000400000-0x0000000000428000-memory.dmp	upx
behavioral1/files/0x000c000000012258-3.dat	upx
behavioral1/memory/2340-5-0x0000000000400000-0x0000000000428000-memory.dmp	upx
behavioral1/memory/1996-6-0x0000000000400000-0x0000000000428000-memory.dmp	upx

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\Debug\zskhost.exe	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe
File opened for modification	C:\Windows\Debug\zskhost.exe	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe
File opened for modification	C:\Windows\Debug\zskhost.exe	attrib.exe

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	zskhost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	zskhost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2340 wrote to memory of 2868	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe	28
PID 2340 wrote to memory of 2868	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe	28
PID 2340 wrote to memory of 2868	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe	28
PID 2340 wrote to memory of 2868	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe	28
PID 2340 wrote to memory of 2688	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe	31
PID 2340 wrote to memory of 2688	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe	31
PID 2340 wrote to memory of 2688	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe	31
PID 2340 wrote to memory of 2688	2340	20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe	31

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2868	attrib.exe

C:\Users\Admin\AppData\Local\Temp\20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe
"C:\Users\Admin\AppData\Local\Temp\20b5ecf5e5871f282ce3ae72870ceb77d5fed1af9383cc3fb52835d116aaec3f.exe"
1⤵
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2340
- C:\Windows\SysWOW64\attrib.exe
  attrib +a +s +h +r C:\Windows\Debug\zskhost.exe
  2⤵
  - Sets file to hidden
  - Drops file in Windows directory
  - Views/modifies file attributes
  PID:2868
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\20B5EC~1.EXE > nul
  2⤵
  - Deletes itself
  PID:2688

C:\Windows\Debug\zskhost.exe
C:\Windows\Debug\zskhost.exe
1⤵
- Executes dropped EXE
- Checks processor information in registry
PID:1996

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

2

T1564.001

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\Debug\zskhost.exe

Filesize
160KB

MD5
1214dd490fd082c562de249e3377d58f

SHA1
53e3c659f549aa9eb4dc0505bd7bf3e0f83ad4c4

SHA256
f245dc209f9a5a61455b485d121a6245310609cb6dbc2e2a82fcbdee4a9a98d0

SHA512
490f481996ed7398094939b2c2aa957d8ba48a1560a507ed3139048b5bd5c080eb48753240bb24aa7c95307dc1eca869cf65986d86243dfb6fde4a24cbf00be4

Download Submit
memory/1996-6-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/2340-0-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/2340-5-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads